It sound suspiciously like "halt still" in an east German accent.
if this is correct then it is translated 'keep still" or "don't move"
Confirmed by the link below !!
Halt can mean either check or break which are homophones of cheque and brake respectively.
Translation: Halt / Stop
stop suddenly/quickly
The homophone you are referring to is "halt" and "halt." "Halt" means to bring something to a stop, while "hault" refers to payment of money.
To disparage an activity or idea. Bring it to an abrupt halt.
it means to stop in the presence of a guard or a soldier when they tell you to
In Shakespearean language, you can say "Halt!" or "Cease!" to mean stop.
Halt!
The word halt has one syllable.
Halt chose Will as his apprentice.
The plural form of halt is halts.
Other words for stop are freeze, alto, veto, pause, quit