I reproduced situation with decaying touch. Here is the dropbox save . Or where should I send it?

On next turn Loic will run and heal 300+. DT was casted on current turn. You can rebuff DT on next turn, then skip and he will be healed again.
Mute doesnt help. Regeneration skill still damage Loic. It looks like script or secret heal item (he has no healing items). But it's not fair.