Are you blind? This is over meeks head?If Meek was focused on the ball he wasn't focusing very hard considering it went right over his head. Even if there was no rule about the knees, the umpire could have still paid a block against Meek when you look where the ball ended up. After making contact with Blicavs he had to backtrack just to get anywhere near the ball.
If Meek got distracted by Blicavs rushing towards him and that's why he stuck out his knee then it's a reaction he'll have to get out of his game cos it's now an illegal move.
That's the life of a ruckman, sometimes you'll get a guy jumping all over you and you're also allowed to try to do that to them too, but you can't just stand there and knee a guy who's standing on the ground in the ribs and pretend it's a a defensive move
Also blicavs isnt "standing" he is charging at meek with eyes only for meek.