The original design was cool, but it doesn't make sense given the art. The Knight is only blocking the spell, or perhaps absorbing it through his sword. There isn't any ricochet happening, unless that sword charges up over time and unleashes it power. Which doesn't seem to be the case.
So I gave him hexproof. Because he, as a sentient and intelligent person, wouldn't try to block spells or abilities that grant him more power/functionality. Nay, he would let it happen. Thus, hexproof instead of shroud.