My wizard with his Meztis Wyrmhide Robes was hit with various effects, and the Mystical Wyrmhide performed as expected when he was the sole target; i.e., a Glob of Flame was re-attached to the attacker. But when he was hit by a Cone of Cold and a Magma Spray, in both instances the attachment was removed from him with a successful roll, but not attached to the attacker. If this is intentional, then the wording on Wyrmhide is misleading. [I did not find a thread on this]
So you mean Cone effects, but not Burst effects? There is some discussion about Cone effects: http://forums.cardhunter.com/threads/mystical-wyrmhide-bug.5808 I don't know if these questions have been answered. (I also don't know about Burst effects, but it's probably similar since Burst cards also fling extra copies of themselves around.)
I think it's the copies that don't get reflected, but if the first target hit has a wyrmhide it will get reflected. I haven't tested it much, though.