I've had the craziest idea and it's scraping the bottom of these leak theories but:
What if the person we're seeing here isn't Tom, but someone else inhibiting his body?
I mean look at the first picture, the storyboard clip shows someone with 2 eyes, yet have the horns. And he's also waving his hand like he's not withstanding the heat. Why?
The second picture is a bit strange though. Tom is likely causing the furniture to catch on fire, but he's holding the arm chair with a look that doesn't speak ill intentions. Star is only dousing the fire but not attacking Tom to stop him from damaging the house.
Also let's keep in mind, Tom have been in the Diaz's house in Frenemies, and we've always seen him NOT setting everything on fire by accident.
What am I getting there is, what if the Tom we're seeing here is actually Marco, having switched bodies with Tom by uh, anything, and is struggling to control his new body of an ex-angry demon?
I am really reaching it here, but let's also remember that Eclipsa already has a Body Swap spell in the book ;)