Just to give people a head's up to why this may be happening, but because skill buffs (like Swiftcast) have to be issued from the server, you can actually combo swiftcast and raise TOO fast. The effects of buffs/debuffs don't apply immediately after the skill is used, and there is a slight delay (delay is slower than human capability). To guarantee swiftcast takes effect, wait until you see the buff appear on your buffs/debuffs bar before attempting casting raise. The delay between skill activation and buff is .3-.5 seconds. You can easily hit Raise faster than .5 seconds, thus it would start casting normally and the swiftcast buff would apply to the next spell.