Was it because of Seth
aka the guy who crippled Sting and nearly did the same to at least two other people with buckle bombs, broke Cena's nose, and tore his own leg up trying to cripple Kane, yet mysteriously could never be called an unsafe worker for any of it
Ambrose slinged him into the post. cesaro missed the pads and smashed his teeth straight onto the bar. Dude has lost at least 2 upper front teeth.