Tyrann Mathieu's personal foul on the 2 pt conversion

zatsnzapps said
Can anyone shed some light on why his hit on Baker was a personal foul?

I saw one step and Mathieu's shoulder to Baker's upper torso.

It feels like yet another BS personal foul call against the Saints.

I thought the same thing. It look like Mathieu push him with his hand. Either that or I'm going blind.