The Killer Crab Alien Vs. Aqua Alien

Yes,this is the first topic i made on this Forum,sorry for the bad topic that was deleted.Its gonna be a battle.I made it to celebrate Sigourney Weaver's Birthday!I know this battle is weird since two Xenomorph species are battling,you will notice why.

During a test on a spaceship,scientists put two Xenomorph species in an arena...

Then,the Aqua Alien got out of its contaiment cell and met the Killer Crab Alien.The Aqua Alien was mutated so he can see anything as its enemy.The Aqua Alien jumped on the Crab Alien and tried to slash its head...

But,the Crab Alien threw him far away from him,but the Aqua Alien ran to him and stabbed the Crab Alien in the face.The Crab Alien stomped the Aqua Alien's tail!The Aqua Alien bashed into the Crab Alien and they both fell in the Water Tank which was in the arena!

They weren't seen for a while,but,suddenly,the Aqua Alien came out with the Crab Alien's head!The Aqua Alien ran back to his contaiment cell.When he got out of the contaiment cell,he got inside a vent,and he went to kill the scientists...What could've happened?