Marshall Warren found himself at the intersection of opportunity and moment.

The 24-year-old from Laurel Hollow was in the Islanders’ lineup for the exhibition season opener Sunday night at UBS Arena against the Flyers, comprising the third defense pairing with Cole McWard.

It was a chance. It was his chance to prove to Executive Vice President and General Manager Mathieu Darche and head coach Patrick Roy that he could be factored into the franchise’s plans. That he could contribute.

And when the game ended nearly three hours later, even though the Islanders dropped a 3-2 decision in an 11-round shootout to their long-time antagonists, Warren had done exactly what he set out to do:

He made at least one organizational decision-maker sit up and take notice.

“He had a great game,” R

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