Well if you put in sliced mugwort that might explain the explosion as it wasn't in the potion we were supposed to be working on.

I'm sorry you're grieving, Justin. You're not a burden on me. You're a friend, and I'm here to listen if you want to talk to someone who already knows. (You're also allowed to tell people, if you want to talk to Harry, or Ron. You're not a Healer; you know because you were involved.)