Why was Sri Lanka 's Dasun Shanaka ruled not out even though he was run-out by Sanju Samson off the fourth ball of the Super Over against India in the Asia Cup game on Friday?

For a while, confusion reigned when Shanaka ventured out of his crease after missing a yorker from Arshdeep Singh , who went up in an appeal for a caught behind, while Samson threw the ball at the stumps to find the batter short. But the umpire had given Shanaka out caught behind after a bit of contemplation, and Shanaka referred the decision upstairs to the third umpire Masudur Rahman. After replays confirmed there was no bat involved, Shanaka was ruled not out for the caught behind and for the run out too. It was the timing of the umpire signalling out initially for the caught behind - after Samson's

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