Thanks! I know that, I'm sure that all of his potential protections were removed. (He had SI: Abj, Protection from fire, Protection from magic energy, protection from elemets, spell shield, stoneskin and PFmW) so i did Timestop + Improved alacrity -> spell thrust -> move back -> spell thrust -> move back -> breach - > move back -> chain contingency 3x ADHW. After message that "spell was innefective" i just did Pierce shields combined with breach to be 100% sure. But still nothing.
Nevermind guys, it was bugged on my side, i just reinstalled everything, teleported myself to that shade lich to test again and it's fine now.
Anyway, thanks for answers! I don't know how to close this thread, so will leave it to moderators :-)