Any particular reason we need a grip?
We have a slow now and can remove every slowing and root effect with the click of a button.
We can become immune to them for a few seconds and we have speed increases, it might be a fun ability but paladins do not need it
if you want that ability then u can always reroll deathknight.
How about giving some holy leap charge shit thingy or something, right now retribution really needs better mobility, what we have right now simply is not good enough considering how mobile casters are, rets are the easiest class to kite and it doesn`t even take any effort.