With the Canaries in a promising attacking position as they tried to claw back Villa's early 1-0 lead, Tettey had several team-mates who he could have thrown to with a view to continuing the attack.
Instead, he managed to pop the ball up just a couple of feet, straight to Villa's Australian midfielder Brett Holman.
Luckily, Norwich improved in the second half and salvaged a point through a 79th minute equaliser - though manager Chris Hughton was still not happy given that the Norfolk side pressed hard throughout the later stages.
"I think it was two points that got away," he said.
"When you are 1-0 down, you are delighted to get back in the game.
"If it’s 0-0 and you have the pressure we had at the end, you are more disappointed.
"You can look at the game apart from possession, balance of play and amount of ball in the final third, as one of three clear-cut chances.”