How about both?
Take one of the animations, and do a sample reflection, that is, write out the samples in reverse order, but leave the
lines the same. Then place the two side by side, with a sharp line between the two so it looks like Kirk/Trump is doing his transformation in front of a mirror. At first, the fact that there are two separate animations may not be noticeable because they are so similar, but after a few viewings, the subtle differences will start to become apparent and it should give a really jarring and creepy effect.