It locks monster in "dmg receiving animation" which makes imposible to interract with 3x3 squares around already dead mob untill animatin is over. I've solved that issue by removing both "dmg receiving" and "death" animations, not an elegan solutin, but works for me. The other solution was to inject dll and hijack packet that responsible to force client execute damage animation. But maybe i missing something and there is other way to do that with just GRF edit, that's why i asking.