First it is a foul. He left the field of play with both feet and jumped in the air, under rules of competition that would be textbook jumping in, which is a foul. Second, he turned his body and did not face the player, again that is a textbook charge. If you are going to jump in the air, and turn your body at the same time into a player who has the ball, you aren't playing the ball.
Now, how bad is it, he did not lead with his head or his elbow, which is good. He actually crashes into the mid section (from the airmpit down) of the white player, which shows there is no intent to injure. A really good player who would want to hurt the other player would most definitely lead with the head or elbow, this blue player just kinda runs over his opponent, which is completely careless. Depending on the temperature of the match, yeah maybe a YC at most.
Suing? If you think that is something that will hold up in court you are crazy, and a judge would laugh at you and throw it out. The play wasn't even serious foul play (which would warrant a red card), do us a favor stop watching soccer.
