So I'm making a Call Of Duty edit, but I'm having an issue. I have applied Twixtor Pro to sync the clips, I slowed down the clips to 30% speed, but the issue I'm having is that the actual clips stops before the footage does, (example picture below). Please help me fix this because this edit is going very well and I really do not want to scrap it. Thank you!
You need to look into Twixtor's help documentation for how to use it.
You have to pre-compose the clips to a longer comp and apply the effect to this pre-comped layer. As Szalam said, it might be useful to actualyl read the help for Twixtor. Effects cannot extend layers, only AE's native time-remapping can.
I never apply Twixtor to a movie, I add it to a solid and select the movie layer as the source. That way you can slide the in and out point of the twitter layer around as much as you like and not have the problems you are having. Twixtor requires training. It's far to complex of a 3rd party effect to just jump in and start wiggling the knobs.