RSB II: Rearrange Phase 4 opening moves

Desperation Slash is now always used as the Phase 4 opener.  If the
player survives that, then he tries for Alcohol and, failing that enters
Phase 4 proper.  Insta-kill attacks such as Desperation Slash can now
also be countered; going into Counter Stance will halve the damage as
with normal attacks, preventing the kill.