Do budgies have survival instincts

Recently been trying to let my budgie out of his cage, and while he’s been stubborn to leave, I only try between certain times when I’m sure the house is empty because on the off chance of him being in the bedroom when my little sister comes back and she goes in the room while he’s out and like accidentally sits on him or something 😭😭 like is this a possible situation or will my budgie have the brains to stay out of the way or dodge?