Below is a series of stills from the sequence leading to the Oilers' 2nd goal.
Connor pressures the initial puck carrier (RD), who swings it over to LD. At this point Scheifele and Connor go to pressure the LD. Wheeler's responsibility is to cut off the neutral zone, particularly since McDavid is cruising and looking for a break. Instead, in the first frame you can see that Wheeler if focused on the puck carrier, and hoping to pick up a turnover to go on offense. Remember, it's the 3rd period and the Jets have a 4-1 lead...
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The LD, with plenty of time to work chips the puck up the boards past Wheeler to McDavid who is turning with speed. CSW all get caught within 12 feet of each other in a cluster along the boards at the Oilers' blue line. McDavid now leads a 3 on 2 with a ton of space through the neutral zone. Remember, the Jets have a 4-1 lead in the 3rd at this point...
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Now the Oilers have a 3 on 2 led by McDavid, and Morrissey and Trouba can't maintain a good gap because there is virtually no back pressure. Wheeler, who was the high forward on the initial forecheck is trailing badly, and Scheifele is caught in no-man's land, hoping that Morrissey will once again make a great stick play so Scheifele can turn and go on offense again, I guess...
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McDavid draws Morrissey over, who makes a good play with his stick, but Rattie is wide open down the right wing and picks up the puck and roofs it.
This play is a good example of a line that is focusing too much on turnovers and going on offense, instead of defensive positioning and the physical play needed to win the puck in their own zone.