4 a la 1

[ Oikawa might have found the roof to himself this time around, but all his traipsing around on the tile isn't exactly a subtle venture, not for the other denizens of the top floor anyway. With the thud and creak of footsteps overhead becoming too suspicious to ignore, Sigma swings out of his own window and eyes up the ascent for himself. He can't see anything from here, but... it doesn't look like too bad of a climb. ]

[ So with one less telescope and significantly more upper body strength than the source of the ruckus, Sigma scuffles his own way up the side of the building, propping his chin over the edge of the tile to peer around and spot... Oikawa... With a telescope? ]

What, your window have a bad view of the nothing out tonight?