since they're both floating abilities, you resolve them in the order you choose. you can apply the qfv first, then fof, in order to get the most out of the speed boosts.
if you apply the fof first, and that brings the speed to 4, then the qfv bonus will wait for the next applicable attack.
AwesomeDhalsim said:
If my interpretation is right, then I think if I play a 3 speed attack, only 1 QfV effect trigger and resolved, then my opponent E: reduced the attack speed back to the print speed, now the 2nd QfV effect can trigger and resolved, right?
Not exactly, because QfV will only resolve at the point an attack is played.