Did Yacob not seem to make an attempted 2 feet and a bit of a jump as he heads in, seemed like he did.
As for Grealish, first was minor, but a pull back is just that so deserved.
Second - he goes down. Running through for OGSO, last defender challenges him, whatever contact is made or not the result is he goes sprawling. AT has two options - either he is giving a red to defender and FK to AV, or he has to give the YC for SI.
As he lands, he turn onto his side, loks at AT, hands up which to me is asking "ref did you see that, where's my FK".
So that takes out the RC and FK option, leaving a YC for SI.
I've seen guys kit by a 7.62 stay on their feet longer!
As for the pitch invasions, dangerous for everyone. How long before a player gets injured ankle / knocked over / head injury, or someone bring a blade to a game....