"It was a captain's performance," said Villa manager Dean Smith.
"For the other side of the game people don't see, Jack ran 60 yards to back dispossess players [at times]. He was integral to everything, he got the goal and provided an assist. All in all, he was really good."
"In the context of the game the sending off has an impact," said Brighton boss Graham Potter, "We were the better team and in control until then."
But despite still causing the hosts problems on the counter-attack and with a point in sight, Brighton was punished for a defensive lapse with two defenders being drawn to Grealish and Targett allowed running beyond them in the penalty area.
"It's a painful one that is for sure," Potter added. "When it happens with the last kick, it's a heart-wrenching one."