that I've ever played, is that about one in three rangers logs out as soon as they realise they are marked, and about 9 out of 10 times they'll log back in in 5 minutes or less.

I prayed about it with one guy who did it after literally every fight we had, and the imm was not interested. He didn't seem too interested in the fact that it was an elf ranger who pk'd and looted his groupmates either. (That being our groupmate. I managed to mark him and force him off.) Think something hardcoded is needed.