What kind of a wimpy bow was he using?Inasmuch as it didn't do the job, a wimpy bow indeed. Judging from the description of a foot long arrow, my guess would be a weak or poorly aimed crossbow.
Whoever shot it needs training, not animal sensitivity courses.
Poorly aimed? No, I think weak must be the case. With a bow suitable for hunting you hit any part of that cat and you are gonna get a passthrough, field point or broadhead. Either that or the cat's gonna drop dead.