As he enters, Jon is attacked by one of the dead rangers he found, now resurrected as a wight and despite cutting one of its arms and impaling it with his sword, it refuses to fall.
Jon is attacked by one of the dead rangers and despite cutting one of its arms and impaling it with his sword. This is what it refuses to fall. He found the dead rangers. The dead rangers are now resurrected as a wight. He enters.