This easily could have resulted in an interception. He decides to throw the ball up in an attempt to throw it away despite being in the pocket.
Coming off play action with an unblocked Josh Metellus bolting in, Heinicke is in no position to see the field. There are moments where you simply have to take a sack.
On the very next play, Heinicke nearly throws one of the most reckless interceptions a quarterback can ever throw.