I think Pollard embarrassed himself a bit here. Starc HAS to be that worked up to bowl quick and want to hit a batsman who will smash him out of the game if he gets half a chance. Look at Steyn, Johnson, Lee, even Jimmy Anderson. They have all thrown dot balls back at batsman and sledged so badly the stump mice have to be turned off. Fast bowlers just have to be that way. Starc was worked up and angry so when Pollard backed away he first thought to follow him and perhaps acted petulantly. But it is just impossible for someone running in at that pace to see a batsman move away to leg, think he wants to give himself room to clobber it and decide to follow him then last minute realise Pollard is pulling out and just stop the action mid way through. He is bowling 90 mph!
Plus for all that stuff I said about angry bowlers there is an equally strong case for stoic batsmen. Viv, Tendulkar, Amla. All the best batsmen will just stare you down and hit the next one for four. Or even better, stare you down and leave the next one like chanderpaul or Dravid (different format I know) letting the bowler know he is nowhere near getting in their head.