Believe Giggs mentioned something about Man United training so hard that the 90 minutes of game time was easier in comparison while "train as hard as you play" is fairly common idea. In this clip the ball remains in play so would be stranger for him to stop playing and check what seems to be a hard but fair challenge.
Unless, of course, you're a presumably English based Twitter page where you get hits for this video and perhaps force your main competition early doors to face difficult questions which can distract and disrupt.