Mystery Wasp ambushes butterfly and cuts wings off in flight!?.

Observation - Mystery Wasp ambushes butterfly and cuts wings off in flight!?.. Description: Twice last summer i observed a Cabbage White butterfly being attacked in mid air by a small wasp. It flew round briefly with the wasp attached as the wasp chopped its wings off and then flew away with the body! This occurred in my back garden in 2 differe

Twice last summer i observed a Cabbage White butterfly being attacked in mid air by a small wasp. It flew round briefly with the wasp attached as the wasp chopped its wings off and then flew away with the body! This occurred in my back garden in 2 different places. Is this normal behaviour for a common wasp or a specialist? it was quite a brutal event to watch?