BOSTON — Two of the Islanders’ six defensemen were again rookies on Tuesday night against the Bruins at TD Garden with Laurel Hollow’s Marshall Warren playing in his second NHL game and No. 1 overall pick Matthew Schaefer already the team’s most dynamic blue-liner.

It’s a promising sign for the organization’s future, since getting younger and faster is always a must in the NHL. But it also comes with responsibilities for the veteran defensemen, who must protect their new teammates and protect their own jobs.

The Flyers got overly physical with Schaefer as the Islanders opened their four-game road trip with a 4-3 shootout loss on Saturday afternoon , with the match also featuring Warren’s two-assist NHL debut .

But the Islanders have been quick to confront any opponent who comes at

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