Fix instant abilities

[Nezacant]

I find this problem incredibly frustrating as a whitemage. With benediction I can't stand when the delay causes a tank to die even when I clearly cast it while they have HP, but on top of that the fact that the spell defaults to me, healing me for 0 health when I have 100% HP. They should at least cancel the spell if you attempt to cast it on a dead target according to the server.

Also annoying when quickly hitting swiftcast then a heal, and having my casting bar show up for the spell since swiftcast never went off in the first place.

Yeah that happens to me all the time too.