Funny how our reactions work.
I dove into a backstreet intersection on my Jamis (geared bike) the other day ... and a car came flying up the road towards me. So I grabbed the brakes and veered to go behind him. All right and proper and there was no danger. The interesting thing was that I also tried to apply back pressure on the pedals, like I would on the Europa (fixed gear). Funnily enough, it didn't work very well seeing the geared bike has a freewheel
Similarly, if I get onto a loose surface (and there's a lot of that on my commute), I immediately start trying to control my speed with my legs ... which is great on the fixed Europa and rather ineffective on the geared Jamis.
It's why it's important to practice safety moves because in a 'I need to do it NOW' situation, you always react the way you've practiced it, whether that's what you should do or not.