I think it's worth noting that the clip you posted is nobody out, nobody on, bottom of the 2nd and he's looking to get on base there.
Grandal is also one of the better bets on the team to take a walk, albeit the ump last night was one of the worst umps you're ever going to see. But still maybe he walks, and even if not, Robert is fast and King isn't exactly overwhelming in terms of stuff. He is the kind of RP this team is going to light up anyway.
I just see it as giving up an out and taking the bat out of the best hitter's hands with the game on the line.