Seeing them getting busy dealing with the monkey, Ban and Eva did not waste the opportunity as they closed the distance towards them in an instant.
He did not know why they ignored him and Eva but it does not matter anymore. As long as they could eliminate the summoner, the summon would automatically be unable to battle as they would immediately disintegrate and return to the Monster Realm, as per what the System said.
Just like any other summoner battle, the Dark Guild members as well as Emilia were at the back of each of their summons, ordering them to fight on their behalf. The weapon on their hands was only used for their protection and not to attack.
Ban on the other hand was different. As he learned martial arts with his gramps and even fought normal wild animals as training before, he naturally could not ignore his Beast fighting on their own. It was already engraved on his memory that he must also fight head-on.