Well we can debate whether that's incidental contact or his an assister all day... It's interpretation, but there's an argument that he uses that contact to give himself an advantage at ruck time, and doesn't allow Croft to place the ball. Where is the benefit of the doubt given to the attacking team? The number 5, deliberately falls on the wrong side, and does not allow Croft to play the ball - that's a clear penalty too. So I was just taking offence to the comment which said Youngs should 'grow up'. Not that it mattered, Leicester were massively outplayed anyway.
And yes, the number 5 falls and the wrong side and doesn't allow Croft to play the ball. Croft has to be allowed to play the ball, and a combination of the hooker and the number 5 prevent him from doing so. So I'm not sure why Ben Youngs needs to 'grow up'. If you've ever been on a rugby pitch you'll realise that in the heat of the moment, if somebody pushes you, you push back.