Lara was frustrated yes. The reason for the frustration was not due to the ambiguity (which I still could not believe went against Dhoni. I am no expert at the cricket rule book however I do know that whenever there is a "doubt" in any decision, it has to go in favor of the batsman. This was definately one of those decisions.) but the fact that Dhoni was lietrally "killing" the bowling attack. The WI had no answer to his onslaught (thanks to milk, keep it up Dhoni :-))
The Pedro collins incident was something that could be overlooked, but the Lara incident was shocking. We all know how Lara likes to project himself as a "gentleman" of cricket. Well our friend seems to have forgotten that and like ordinary players seems to be more focussed on the result than the effort.