Originally posted by StiltmanFTW
I don't know anything about the younger body thing, you might've made that up? 😛But he WAS brainwashed by Emma Frost.
Anyway...
1) Tigra did fail.
2) Karnak doesn't have Tigra's agility... or her skillset. He probably doesn't have her speed either.
Tigra failed, true: but if Karanak blew his blood vessels up, the effect would still be the same (i.e. minimal amounts of kinetic energy applied, with the effect of no blood going to his brain). Or even his heart.
As for speed, he did chop a bullet in half with his fingers, so whilsst he's no cat lady, Shaw isn't exactly a speedster (though he is fast).