Drain Soul Felwithe

[Vriggchan]

Hey, coming across this bug while hunting in Felwitheb. When I cast drain soul on Guard Tistan, my mana cost is deducted, it looks like he takes dmg, i get the message i get healed, but nothing other than the mana cost actually occurs. I have been hunting for a couple of weeks and this has been a constant occurrence. If i drain soul x2 the second one works, but the first one does not. Figured I'd post about it here to see if it was something you guys would be interested in.