Gravity Bow and Sorcerous Bloodstrike

[Edigido Ley Kran]

Hey, so I just multi-classed my fighter into sorcerer and I picked up the Gravity Bow spell. I also get an extra feat and I happen to see the Sorcerous Bloodstrike feat. Would Sorcerous bloodstrike work when Gravity Bow is used?

I can see both arguments to the ability, but I'd like to know what others think. My GM isn't aware either (Yes, I've already asked him) and I figured that I'll talk to you people next.

[Talonhawke]

I would say no since there is no way to show the spell is whats killing also that could lead to some serious cheese saying that the barbarian I enlarged activates spell strike or the fighter who i gave haste to.