"Take that creature off my back!! I can feel it!"; ""You will regret interrupting my studies!"; "You will be the next infected one... CRAAAHHH!"; "Science... is a curse."; "Run as fast as you can."; "Oh by the gods! What is this... aaaaaargh!".
Mutated Humans fight until death and can not be pushed.
Standing diagonal won't help you avoid it's wave because it's very wide (counting from caster it's 3, 5 and 7 sqm). However diagonal position is useful to not get hit by earth strike which poisons you heavily.
Paladins: Run and shoot, they do not have very high defense and can be killed quickly by any paladin with 65+ distance skill. They are similar to Cyclops with the addition of poison damage and death wave attacks.
Knights: Just close in on them and use melee. If you are hunting them, you have to expect becoming poisoned many times, therefore, using Exana pox is a waste of mana. Avoid packs of 5 or more. They bring your hitpoints down quickly.
Mages: just use flame strike, being careful not to run into bigger respawns, otherwise they can be dangerous, you can use energy beam and for druids you can use ice stike to kill him.