Lyrisa does have Arcane Sense so maybe a roll every time Leifr attacks until she gets it? That or she thinks its an interesting sword and intentionally tries seeing if any power is behind it.

PS: I'd be an intimidated bandit if my friend shot an bolt at some young noble and hit him, and then another friend ran over and gave him a good cut only to immediately be K.O.ed by the noble and his damn horse...