LAS VEGAS — First, a disclaimer: Finding out late in the day that head coach Mike Sullivan would not be behind the bench for their game Sunday night at the Garden against the Detroit Red Wings was clearly a curveball for the Rangers’ players, something they had to adjust to.

And yes, it was the second night of a back-to-back set, and it followed a game that had gone to a shootout the night before, which could account for some heavy legs.

But neither of those things could explain why the Rangers were outshot, 42-19, in their own building in a 2-1 loss that wouldn’t have been that close if goaltender Jonathan Quick was anything short of magnificent. Nor could they explain why the Rangers, who impressively were 9-1-1 away from home this season before Tuesday night’s game at T-Mobile Arena a

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