Im not saying he is extra strong, just the matter that he fought a shit ton of small people and suddenly a big guy, complete with intro music and everything shows up, goku is going to assume he's in charge. So he's gonna try to talk to him and figure out the motive and what is actually going on. He does this all the time. Think of all the filler there is in DBZ, movies included of him talking or trying to talk to the enemy before they fight. Whether they understand him or not he still tries. If he's lower level he goes defense and tries to talk, if he's powered up he talks shit and dodges. And that dodge time is enough for atheon to teleport him.