Ralls red card appeal rejected

[The Bloop]

Are you watching the same game? He’s our best midfielder.

He has got the highest passes in our team, most interceptions, most ball turn overs in the secondary third, most key passes, most passes forward... it wasn’t a sending off. You don’t know what you’re talking about

Can someone please tell me what a 'key pass' is? Heard SSN mention it loads but haven't got a Scooby what it is.