Well, try to explain where those 0.3s came from when all I changed was to add fastfalls =).
edit:
Just went and tested it, just because someone like Magus is apparently saying something that can't possibly be true.
Results with Fox:
Shooting a single laser has 3 frames on which it totally cancels a fastfall. And I mean totally, there's not even a real continuous "deceleration", you immediately stop fastfalling and go to maximum slowfall speed.
These frames are 1, 4 and 14. Yes, pressing B in the air will instantly kill your fastfall, and even if you re-fastfall on frame 2, it will be canceled again on frame 4, and again on frame 14.
Multiple lasers all have their own fastfall-canceling frame(s?), but I'm too tired to check what they are. I just know they are there, because I had to fastfall constantly in my BtT run (though not on the very first frames, had to time them correctly to actually hit with the lasers).