After seeing that replay, I saw what Coyle was thinking.
Gryz was in front of the net last Coyle saw, so Coyle assumed Gryz was going to jump into the rush and Coyle would stay as the last guy back.
Gryz instead went into a defensive posture, giving Coyle an outlet behind the net.
2 things went wrong here.
Gryz should have been where Coyle passed. Coyle didn't have pressure on him, he didn't need the safety valve behind the net. Gryz stays in front of the net, starts skating when Coyle safely has the puck, and it hits him on the tape and they are leaving the zone with pace.
2nd thing wrong, Coyle didn't look first before passing. Those no look plays work great and throw off the defense, but you cant do that through your own slot.