The Dink Network

Trying to make a sprite explode in a blast of blood, I've run into a small pickle.
The procedure is:
Sprite freeze (duh.)
Sprite disappear. (sp_kill)
Blood rain (play_seq command)
The sprite disappears all right, but no blood rain
I've checked everything, semicolons, spaces. Is there something wrong with the command?

play_seq (seq, x, y);