Am I missing something here?

I enjoy watching GM blitz games on youtube and I'd like you to take a look at this: http://www.youtube.com/watch?v=pZL9onfQzBU at 3:25 after Le Quang Liem played Bg4, why didn't Movsesian exchanged the bishops and go after the enemy pawns. It would have been such an easy win. Can someone explain this to me? Because I can't believe that a super GM can miss something like this, not even under severe time pressure.

Anyone??

You mean by moving his king towards those pawns on h7 and g6? Wouldn't his b-pawn then fall and black's c-pawn become a deadly passer? Just a guess... 

How can the b pawn fall? The king is far away and there's no pawn breaks  black can make. Which is black c pawn? He only has a and b pawns...? I don't understand how can a GM miss this? Bg4 by Quang Liem is a blunder. This game is a total mystery to me.

Yeah, there's a pawn on f5 that's sort of hidden.

I didn't see the f5 pawn. Lol, now I feel kinda stupid. Thx guys, this was really bugging me.