ID:897756
 
mob
Bump(var/mob/M)
if(src.Monster&&src.InSurvival)
M.LoseSurvivalRound("Lost")

I am new to pixel movement and having problem since i cant make this work the bump does not reply anything.
Try a debug message to see if Bump is actually being triggered. Also keep in mind that the object in the parentheses is the object that src is failing to move into.
i read byond reference on bump and it said
"If the obstacle is a mob and src is in its group, swap their positions. This is only done if the mobs both move by full tiles and do not use pixel movement, to preserve the behavior of older games. " that means pixel movement doesnt work
No, it's talking about swapping. Try doing what Kaiochao said now.