Abaddon had sensed Wiper's presence before but had done nothing until now to acknowledge it. He was honestly growing weary even though he had fed on plenty of creatures when escaping Apollyon's area. That particular task had still taken hours, and he was met with much resistance even though Apollyon wasn't even remotely trying to stop him.
He needed to rest and minimize as much conflict as possible until he had recovered at least slightly, so all he decided to do was question the sneaking individual. 

"Well... what?"