NFL Legal Pass Rule Today

[vhcat70]

Burrows threw a TD pass today when I thought his knee was on the ground. He was not down by contact imo but rather tripped over his own lineman. So, assuming a NFL QB has a knee down but is live as he could continue to move forward, I'd think that a pass would still be legit. They gave the TD, but made no comment after review. I know in college the QB would be down & no pass.

Thoughts?

 

[HerrosHeroes]

The rule is dif in college and pros.
If your knee goes down in college for any reason you are ruled down.
In the NFL you must be downed by contact by the other team.