Well try to do it again but in a neutral place neither has been [bathroom], do it during the day when they are both extremely tired and leave only one pouch out. The goal is to get them to be so tired that they would rather sleep than worry about who is who.
If you see them chase each other this is okay, swatting, and making crabbing or clicking noises this is fine but do wear gloves in case you see balling up, biting, and hear yelping.