Ponyboy: acting brave but internally screaming. whispering "fuck fuck fuck fuck" to himself. tripping everywhere.
Soda: terrified. screaming at everything that moves and hiding between Pony and Darry.
Darry: isn't really scared by this type of thing but enjoys seeing all the boys get scared.
Steve: goes to the front to lead the group but immediately regrets it.
Two-Bit: honestly laughing at everything. roasting the characters that are trying to scare him.
Johnny: just having fun. likes that he's impressing everyone by not being afraid.
Dallas: could attack the characters at any moment. not necessarily scared but his first reaction to being startled is to throw a punch.