Sneak walk animation - the heels barely touch the floor, palms out flat, arms above waist, large steps and quick steps.
nervous variation - mouth open, eyes focused, eyebrows high and perpendicular
In the references provided, their are features that make it clear it is a sneaky walk as they have:
open palms facing the ground,
heels high above toes,
arms held high with elbow bends,
knees usually bent and never straight,
Shoulders tensed and high up,
Additional features:
Chest and head moves in sync (if chest moves head moves in same direction),
Chest moves to balance weight as feet move,
The direction the legs move is copied by the arms but opposite (if right leg goes forward, right arm goes back but leg arm goes forward for balance),