With the plan of Barry Allen and Team Flash well and truly out of the window by this point, the Scarlet Speedster breaks yet another one of the cardinal sins of time travel: dont tell anyone in the past whats about to happen in the future.
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Ignoring this rule, Barry again delivers another WTF moment by telling Cisco that Hartley Rathaway knows where Ronnie Raymond is. The recovery of Ronnie was something that played out just fine (well, initially at least) in Season 1, but now Barry has given the past S.T.A.R. Labs crew a heads-up on things.
But surely that, not to mention earlier pointing out that Hartley just may have some explosives on him, wouldnt change things all that much, right?