Ok, according to duelist, when you blade yourself, he takes the blade, but when you blade somebody else, it should be fine. Well, running darkmoor part 2 right now, when ally #2 blades ally #1, Akhtang now rips it off of ally #1. I checked the update notes and saw nothing about this. Was this changed deliberately? Because if not, it's a bug that needs to be fixed
He will steal the blade from the target, no matter who casts it. He only steals the first blade of a tri though, so if you have a hitter other than fire or life, spirit or elemental blades can work. Beware though, stolen fire blades will be used against you. This guide may help: