(Let's pretend that you somehow know about Pennywise and that Patrick is going to die. You are in the same school.)

You're studying in Derry. You saw how the Bowers Gang bullied one of the students and after Patrick went to look for the escaped victim. You walk along the river and see in the distance how Patrick went into the sewers! You hesitate, but you go there not wanting anyone to die again.

Patrick walks along the sewers often lighting the way with his makeshift flamethrower, lighter and a gas canister probably. He doesn't pay much attention to sounds or darkness. But he suddenly felt someone touch his shoulder and he immediately turned around.