I have. Not in sneak atack, i talk to him then we fight, set in max difculty.
Stats:
lvl 81 Brenton, lord stone
Nightgale Armor
100 skill and perks in one handed, bow, sneak, 2 in steamina and un in health 0 in magicka and magic resist from restoration tree
Chilrend, mirak staff, nightgale bow...