In fact it's even more plausible, because they actually did the play twice that shift. Consecutively one after the other (within 4 seconds of eachother). It's the very same play that I posted from the Boston series.
Play 1) Play 1, Marner gets to spot, pucks pushed to him from Matthews along the boards, he tries the quick feed to Knies in slot. Pass is blocked.
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See similarities to Boston set play in last year's playoffs: ii
Boston set play: this happens to be the quit crying bro shift where posters say Marner/Matthews were mad about a set play not happening (maybe there is truth to it). Nylander doesn't make this pass to Marner, instead he carries it all the way to Marner.
What you don't see is that the leaf from the opposite side also attacks the net, so Marner has two pass options. The player in the slot and the leafs coming down the opposite wing. Which is the same place Matthews come from on the goal yesterday.
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Play 2, Marner stays in very same spot, Reilly picks up the puck on the boards and pushes it to Marner, whose in the same spot and squared up for slot pass. Matthews attacks slot.
It's clearly a set play. It's very similar to basketball set plays.
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