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They have found his car near a boat ramp. I suspect he is across the river to another vehicle or hightailing into the woods. Sounds like this was advanced planned.
Having lived in Maine for many years I know that not many people carried firearms in their daily lives (then). The bowling alley probably served alcohol so may be carry prohibited and of course the "bar" was also. BACK THEN concealed carry permits were issued by the local police chief and I found that they tended to sit on them hoping you would' forget. After 3 months they became "shall issue" unless the chief could provide a valid reason to deny. Since then Maine has became an open/permitless carry state. This shooting will more than double Main's annual murder rate.
The people are generally practical, gentle, and well mannered. I know the influx into Maine from Massachusetts and Connecticut has brought a lot of "Boston" politics/voting to the area. That can never be good.