Under normal circumstances, Jaem wouldn't have even thought of going back to even the front door after what had happened to him there. It was obvious that the spot around the front door was well within the range of the werewolves skills and that standing there was akin to inviting them to affect you with whatever skill they had left.
If Jaem hadn't been already scared of his plan to escape the apartment by climbing down four storeys with nothing but some tied up clothes for support, nothing in the world would have been enough to make him go back to the gate, how much more open it and spy through the cracks at whatever had happened in the corridor.