Haha, I've always loved them in spite of their quirks. I'm glad yours hasn't gone after your nassarius. This is a first for me. I've lost a lot of astrea turbos, and even smaller conchs.For now .......
You are right, it probably wasn't Cold bloody murder. My murder hermit has yet to go after my nassarius snails. It was probably opportunistic like you said, and now it wants to wear its victory.