If I deal damage then leave alone, and another monster kills, I get 42.5 slayer xp.
- If I am only one attacking on death, regardless of it's health when I started, I get 85 slayer xp.
- If me and any number of other monsters are attacking, I will get 42.5 slayerxp.
It is impossible to get xp whilst offline by damaging an enemy, logging out, and letting it be killed. Nobody gets the xp.