If you jump to a square by casting the "vampire strike" spell, and there is an object on the ground, you don't get the full description of that object when you 'x' or 'E': it'll show up as "a Short Bow (x2)", not telling you its combat bonuses or whether it's an artefact. I think you have to move off and back on to see the details (although resting might work, I'm not sure if I've tried.)