LOL, This kid thought he was so smart.
How many warning signs does one person need before they realize that maybe they shouldn't be there, shouldn't go in, and probably get as far away as possible?
1. Nobody answered the phone
2. When the door was closed, that sign read "CLOSED"
3. When you opened the door, the ENTIRE PLACE WAS COVERED IN SPIDERWEBS
seriously, that is not normal. This is no time to mistake stupidity for bravery, and no time for curiosity because that already killed the cat.
edit:
5. Your friends shoe covered in spiderwebs
6. GIANT SPIDER TRACKS LEADING INTO THE MINES "5X their original size"
7. In his own words "no sign of the arachnids anywhere"
So where does he head?
Into the mines of course....