Everything is on fire, or about to be. The unconscious pilot is strapped into the seat. Better out now than in for even a few more seconds.

Also, I guess, one could use the procedure to render safe and unoccupied seat rather than leave it in the wreckage for some kid to play with. The seat alone doesn't have a proper chute. So it wouldn't be the safest thing for a SAR team to do if their helicopter was parked nearby.