It's a late September game between two teams going nowhere. What did the announcers expect? I recall a night in the early '80s at Shea Stadium during a typically dismal Mets game when two guys set a bunch of cardboard concession boxes on fire in the upper deck. Taking selfies is 100 times more appropriate behavior than pyromania.
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I love the exasperation:
http://mediadownloads.mlb.com/mlbam/2015/10/01/14-416010-2015-09-30/web_cut/mlbtv_511523483_1200K.mp4
And hey, good for them:
https://www.facebook.com/axoasu/posts/950038358385816