Yengi was replaced by Bruce Anderson but stepped over the line in showing his frustrations and Colin Steven flashed second yellow.
The Lions striker was already on a yellow card when he was withdrawn for Bruce Anderson early in the second half. Davie Martindale's side looked to be on their way to an unlikely victory over Hearts as Stephen Kelly's double had them 2-0 up at Tynecastle against a shell shocked Hearts. But Steven Naismith 's side woke up and blasted four goals without reply before half-time through Jorge Grant , Yutaro Oda , Cammy Devlin and Lawrence Shankland 's penalty.
The message at half-time from Martindale from his players wasn't likely to have been overly positive. But a good start was essential to get them back into game. But Yengi, after being subbed off, let his frustrations get the better of him and booted a water bottle in anger. Colin Steven wasn't having it, and marched over to give the forward his second yellow and sent him up the tunnel.
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Hearts FC David Martindale Steven Naismith Jorge Grant Yutaro Oda Cammy Devlin Lawrence Shankland Scottish Premiership
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