Yes. But ears bleed profusely even if you only nick them. And for what it's worth, over at the LEE KRAMER board, and on Twitter, some are wondering if it may have been a setup.
I don't think Trump would allow anyone to shoot him in the ear, but what if it's some third-party bad actor? Putin's name has been brought up.
But... It sounded like a BB gun. Why would the shooter have chosen that? They rarely cause fatal injuries. And if he could somehow have got an air rifle into the rally, he could have also brought in an assault rifle.