Usopp has already been using conquerors haki for a while
Luffy emitting conquerors haki while clashing with Ulti
Usopp doing the same but he doesnt have armament so it barely lets him survive
Usopp made Sugar foam from the mouth like a conquerors victim when he knocked her down
Same with Perona
He resisted a hax devil fruit effect with his conquerors haki and knocked down those entities instead of being knocked down by them
