Central D's pass it back and forth all the time in every league - however you can't coach a player not to slip over at the vital moment. That was just one of those things. Like when that goally threw the ball in his own net, or players score own goals. These things happen and I don't think its on the coach, that would be a little harsh (unless it happens over and over again, in which case you get the player checked out as they are clearly unsteady on their feet, or purposely scoring that own goal!).