Okay, if you see a druid do that then report them to an archdruid. It should take three or four emotes to even try and kill someone. Personally I take about four to just wrap someones leg with a root. Not every one of us is bad so it isn't fair to treat us all like that.
Well, sadly I don't have much knowledge as to how magic works outside of druidism, so I can't tell you anything with that. But again, if a druid does that ask them how long they have been a druid and if it isn't a reasonable amount of time then report them.