Same thing happens when using Crom Faeyr since
very minor spoiler
*
*
*
*
*
*
*
*
*
*
*
it slays trolls. Hit them once, and they get knocked down but you get the XP for killing them, and then hitting them again kills them properly for the same XP again.
May as well take advantage of it since its not going to give you horrendous amounts of extra XP, just a little
