Try that
PHP Code:
new Float:speed = 0.5;
SetEntPropFloat(ent, Prop_Data, "m_flLaggedMovementValue", speed);
Where ent is hostage's entity index and speed is a floating point value of speed. 1.0 = 100% speed.
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ent - индекс заложника. speed - скорость, 1.0 - стандартная 100% скорость.