I'm guessing the thinking here is that he has re-injured himself, so the recommended rest might be to reduce any additional bruising that might be caused by increased blood flow to the injury site. Cold water soaks would probably help too, but I know what a pain in the butt that can be.
To tell the truth, I don’t really know what the reason is...she said something about keeping something in there from moving, but then she also said that blood flow will help...I’m really not sure tho.
Becky