Mini-FOT LogoThe following is based on Fallout Tactics and some details might contradict canon.
Your character has been winded, and cannot run.

Winded is a condition in Fallout Tactics.

Fallout TacticsEdit

A character can be winded from a Critical Hit to their torso, received in either hand-to-hand or ranged combat. If winded, a character's movement is reduced to a walk, as one cannot run when afflicted with the winded condition.

Fallout 3 and Fallout: New VegasEdit

Characters can be become winded by having their torso crippled, making them flinch more from damage taken.

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