This skill is a Special Rule that is only available to specific Star Players. Please visit this page to find a list of current Blood Bowl Star Players.
Watch Out!The first time each half that Withergrasp is the target of an opposition player’s Block action, he counts as having the Dodge skill.
Watch Out! could be useful to prevent a knock down on Withergrasp. Though considering his skill set he is likely to be used as a sweeper to cover the back field and tackle a ball carrier that’s making a break through. Due to that I don’t think he’s going to get hit that often and with his below average agility you are going to want to try and position them so they don’t get marked.
If you aren’t getting hit often then the face this only works once per half isn’t that much of a downside. When you factor in that either an opponent hitting them may have Tackle, or not even roll defender stumbles, then it wouldn’t surprise me if this skill doesn’t have much affect in most games. That does really depend on how you position them, so it might vary from coach to coach.