Yivv

Situation: bottom of an extra inning game. Tied game, bases loaded with 2 outs, and pitcher throws ball four. Base runners advance...a walk off "walk". Third base runner gets a high five from a teammate before he touches home plate. However, he DOES touch home plate. That is not in question. Opposing team coaches say he is out because a teammate touched him. Umpire agrees, calls runner out which goes another inning. Team which had the win, ends up losing next inning. Was the umpires call correct?