Tony Stark isn't one to give out last calls and final warnings when he issues the Repulsor treatment. This time it's different, especially when he's using the Hulkbuster armor and he's dealing with the Hulk. But don't get him wrong, he has every intention to shoot... just with permission.
Morgan's "I love you 3,000" is already enough to balance their 1 out of 14,000,605 chances of surviving this battle.
Tony Stark quickly made an assessment of the situation and immediately called for Veronica and Igor, concluding that they could do the job with the least collateral damage.