When you (daddy) are out alone with your toddler Daughter, or (mummy) out alone with your toddler son, and needed to go toilet for the big one, (omg), what would you do?

I will bring my son in with me but he will wait for me outside my door. I will periodically talk to him to ensure that he is there. He is also taught about stranger danger so he will shout if someone tries to take him away.