I can understand their anger and if it had been the other way round I'm sure I'd have been livid. Seeing Hawkeye makes it look like an absolute shocker of a decision...but you know what, I can actually understand why the Umpire didn't give it. He can see two full stumps, the bowler is going round the wicket, the ball is full and he has very little time/distance to assess how much/if it has turned
If the blue portion of the line isn't there, I still might say it is only clipping leg at best! Benefit of the doubt to the batsman and all that, good decision!