After Barry was done with Caitlin, she was in a state of pure bliss to even care about what Barry was doing on his phone.
And with her legs wobbly and shaking because of the intensity of the sex, she had to sit down the whole time, giving excuses to Cisco and Dr. Wells on why she couldn't do certain tasks.
They both thought that Caitlin must have sprained her legs and asked Barry to take her home, which he did. They then spent the rest of the day and the entire night together, participating in more physical activities.
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One day before Christmas Eve, Barry finds himself in Joe's house, helping him set up a Christmas tree. Super Speed always comes in handy when doing chores like this.
Seeing Barry instantly put all the lights and decorations on the Christmas tree made Joe laugh.
Iris was also present, helping Joe make all the Christmas-related foods and drinks. Joe then had to leave for work, which left Barry and Iris alone to open Christmas presents.
Iris gave Barry and microscope and Barry gifted her a digital camera for her journalist aspirations.
The Iris left with Eddie, leaving Barry alone.
He then went to S.T.A.R. Labs and gave more gifts to his friends. He didn't leave out Dr. Wells either, even though he knows the guy is probably cooking up something really dangerous to harm him. But Barry can't look suspicious. He needs to keep the facade going to catch Dr. Wells off guard.
Everything was going well. No crimes were being reported. People seemed to be in their best behavior on Christmas, which allowed Barry to have some free time.
He is in Cisco's house, watching reruns of Wrath of Khan, when suddenly both Barry and Cisco get a distress signal on their phone.
They take out their phone and see that it's a distress signal from Caitlin.
As soon as he sees this, Barry moves before Cisco can even say a word.
The distress signal is coming from near S.T.A.R. Labs, so with he speed, he arrives there in seconds, and what he sees when he gets there surprises him.
He sees Ronnie. Caitlin's supposedly dead fiancé is choking her to death as Caitlin gasps for air and tries to fight back.
Barry immediately rushes to them.
First, he unwraps Ronnie's fingers from around Caitlin's neck, and then he palm strikes Ronnie, sending him flying and then crashing into a wall.
*GASP* *COUGH* *COUGH* Caitlin immediately grabs her neck and starts gasping for air and coughing as her larynxes are finally free to breathe.
"Are you okay?" Barry asks as he supports her by holding onto her shoulders.
Barry looks at Ronnie, who slowly starts getting back to his feet. He is confused as to why Ronnie would attack Caitlin. He thought they were in love.
Ronnie gets back to his feet and looks at Barry with sheer anger. "And who the fuck are you?" Ronnie asks. His voice sounds as if two people are speaking at the same time.
Barry looks at the angry man before him and realizes that this might not be the Ronnie he knew.
He turns to look at Caitlin and sees her slowly back away, hiding behind Barry. She looks really scared of Ronnie, as she should be, as the guy just tried to kill her.
But why does Barry feel like there is more to this?
"Is he the guy you chose over me, Caitlin? Then you chose wrong because I am going to fucking kill him!" Ronnie yells and suddenly bursts into flames and takes to the sky.
He then aims his hands at both Barry and Caitlin and fires a powerful energy blast at them.
But, of course, Barry is too fast to be caught by simple fire blasts.
The very first thing Barry does is grab Caitlin and take her into S.T.A.R. Labs, where she can be safe. He then runs out again, looks around as Ronnie is frozen in time in the air.
Barry is searching for a path to reach Ronnie, and he finds one. He runs up the curvature of the wall and then propels himself towards Ronnie and smashes into his face with a very fast punch.
Ronnie doesn't even know what hit him.
He gets sent flying and then crashes into the water that is beside S.T.A.R. Labs. Barry stops at the edge of the water to find Ronnie, but he sees nothing but the ripples of water from his crash.
Suddenly, in the distance, the water starts bubbling as something bright starts rising.
A man covered in fire shoots out of the water and flies away extremely fast. His movement was rocky and all over the place.
Barry's punch messed him up bad, but he managed to escape.
Barry couldn't chase him as Ronnie continued to ascend higher and higher before disappearing above the clouds.
'I should go back and check on Caitlin,' Barry thinks as there are more pressing matters to attend to right now.
He runs back to S.T.A.R. Labs and sees Caitlin leaning against a desk, rubbing her neck.
She gets startled a little as Barry appears right before her. "Oh my god, you are okay," Caitlin says, seeing Barry return safe and sound.
"I should be the one who should be concerned here," Barry says, and grabs her chin to look at her neck. It's been bruised, and there are even small signs of first-degree burning.
"I am fine, don't worry," Caitlin says. As a medical expert, she can self-diagnose a little.
Barry doesn't say anything as he feels he will mess things up if he asks about Ronnie.
He feels like this has something to do with him changing time by saving Diana.