TIL via a DeafBlind TikToker and confirmed via a DuckDuck search that, in an emergency situation, if you are with a (culturally!) DeafBlind person, drawing an X on their back or, barring that, palm, is a way to communicate "We have to get out of here, NO DISCUSSION."

Disability advocates often talk about the importance of not physically grabbing/moving people. Emergencies MAY be an exception but now you know a way to communicate instead!