You swing your pink vultite maul at the magru, but when the weapon slices through the magru's flesh, the wound closes instantly leaving no trace that the magru was injured!
>:[
I'd been hoping that around the time puncture immunities were changed to resistances, magru would either become resistance to non-crush damage or -- at least -- become vulnerable to crush damage from something other than a one-handed blunt weapon. Pretty silly that my maul is slicing here when a cudgel would have done the trick.