Slaf chases Marner from the Leafs zone and keeps pace with him. Mailloux standing there and Slaf stuck to Marner, causes Marner to go wide across the ice. Mathews steps up to the gap. Slaf's attention was focused on Marner all the way down the ice. Matthews was in his six the entire time. Mailloux should have seen Matthews coming, and once Marner showed he was letting up, Mailloux's attention should have shifted to Matthews. Or......another Hab could have actually back checked. This wasn't on Slaf, and shouldn't really be on Mailloux either.
Look at these two screen grabs.....the first one shows the start of the play. We see Mailloux pivoting at the blue line and Slaf parallel with Marner. Then we see two habs behind Marner and I think one of the two Leafs is Matthews.
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5 seconds later.....Matthews is streaking in on his own....while one of those Habs players is on OV controller mode in the neutral zone. Looked bad at first on Slaf or Mailloux, but honestly it wasn't them who f***ed this up.
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