Why the hell was a clearly rattled Dan Biggar allowed to do this worrying interview?

Dan Biggar's interview after the Leinster loss was a bit of a worry.

Ross Byrne was the hero for the Blues as his 11th hour drop-goal secured a 20-18 Guinness PRO12 win for the province at Liberty Stadium. However, it could have been a very different story had Dan Biggar not missed that penalty wide. Biggar was a central figure to a lot of the big moments of the game including that dramatic finish and Sean Cronin's outstanding try. Before missing the mark with the final kick of the game, he spent some time on the sidelines receiving treatment for a nasty cut. Obviously, he came back in and stuck it out to the end, but his post-match interview with Sky Sports suggests this may not have been the best idea. Biggar looked dazed in front of the camera, and even admitted as much. What was really concerning though was the fact that he said he couldn't recall the last 10 minutes of the game. https://twitter.com/Sean_McMahon89/status/850740391431331842