Polymorph is indeed bugged - I could kill boss enemies in peace and quiet (if I found those pested frogs afterwards)
Though the assassins changed back, the boss enemies did not.

I hope, others can explain the time unit, I can't sorry <img src="/ubbthreads/images/graemlins/shame.gif" alt="" /> - Bless was a useless spell for me in my game.
Kiya