Misc. rebalancing, RSB II third phase tweak

Robert now uses Electrocute in Phase 3 to zombify Scott before trying to
Power Tonic him to death.  Necromancy was too cheap a tactic in this
case, since the player is conditioned in earlier phases to delay curing
it.  Electrocute makes for a more obvious tell, and also serves as a
sneak peak of the move before Phase 4, when it becomes common.
Slight edit to Phase 5 kickoff

The Phase 5 BGM now plays at the start Robert's last line of dialogue
instead of after it.  This enhances the impact of the line.