It's Him!
When William reached the stairwell, he immediately consulted the Navigation Radar to get a better idea of what was happening above him. The three marked students were already on the 14th floor, but they had yet to leave the starting room despite being almost ten minutes ahead of William's pace.
He decided to consult the System, afraid of some sort of ambush.
-They're waiting for something, but it's probably not you.
Hmm, I'll take my chances then. William thought as he started to ascend.
A few murmurs were heard when he neared the top of the stairs, but they were so quiet he couldn't make sense of what was said. Only when he physically entered the starting room could William make complete sense of what was going on.
He stood on the second to last step, scanning the room carefully for any killing intent or hidden traps.