Which preposition to use with immobile
"'Voir," the carpenter replied, still immobile in his chair by the door.
I found her confronting Monsieur Power, who was leaning in an attitude characteristically immobile against the landing carriage of his machine.
Then she passed on, her face as immobile as before in its setting of wavy gold hair.
To know him properly, one needs to see him at work in a country where sheep abound, to watch him adroitly rounding up his scattered charges on a wide-stretching moorland, gathering the wandering wethers into close order and driving them before him in unbroken company to the fold; handling the stubborn pack in a narrow lane, or holding them in a corner of a field, immobile under the spell of his vigilant eye.
Immobile with terror, he didn't respond to Zimbardo's command.