M4 WG: Imperial Prison
Anders considers what the human prisoner said, and how he said it. He didn't sound desperate, or particularly frightened. It hadn't sounded like a lie, but perhaps it wasn't exactly the truth, either.
It doesn't take long for the source of the stomping to become evident. As you predicted, it is the tall, slender AT-ST, the Imperial All-Terrain Scout Walker. A box-shaped cockpit sits atop two six-meter legs, for a total height just over nine meters. It is slightly crouched while walking, but still an intimidating height for a person on foot. You can see several weapons jutting out from the cockpit, including a grenade launcher, a blaster cannon, and the two chin-mounted heavy blaster cannons.
Warfare 2D to recall more information about the AT-ST, including strengths & Weaknesses
The top hatch of the AT-ST is open, with an Imperial Army soldier standing exposed from the waist up. He scans the horizon, and spots the fleeing prisoners. He raises a device to his mouth. His voice, casual and a little irritated, booms out over the vehicle's public address system.
"Alright, Veshra, MacNuggle: I can see you. You've had your exercise, and now it's time to go back home. Now stop running before we have to shoot you."
The Rebels conceal themselves in the tall grass, and the soaking water should interfere with any thermal readings. The Imperials certainly don't seem to notice, even as it passes over several Rebels in position beneath it.
Athletics 1D1C1S to climb the thing.