NEW YORK — Cam Thomas led the Nets to a 28-point come-from-behind victory against the Knicks at Madison Square Garden on Wednesday. After a cold first three quarters, Thomas erupted for 16 of his 21 points in the final period, hitting a flurry of shots, including the jumper that gave the Nets their first lead of the game with under four minutes to go in regulation. He then crossed up Knicks rookie Quentin Grimes before hitting a 30-foot dagger that delivered the Nets a 111-106 win over their crosstown rival. The rookie out of LSU was one of few bright spots in what was an otherwise lifeless pe…