You were on the Shelly themed floor in a blackout with Pebble. After seeing Tw. Cosmo and Tw. Sprout, Pebble jokingly said their ship name, 'Fruitcake'.

...Tw. Cosmo did not take kindly to that since him and Sprout were strictly friends.

So after Pebble got hit by Tw. Sprout, Pebble had to hide in a corner, which was occupied by Tw. Cosmo, who immediately scratched Pebble with his ichor arm, making Pebble die.

You now had to deal with two frankly cranky Twisteds. By yourself.