Movement and the NPC’s own routine
The clip changes the pose and nothing else. The NPC’s own schedule and behaviour keep walking it while the clip plays. To keep an NPC in place, hold it with NpcMovement.SetActivityEnabled(modId, npcId, false) and release it with true when the clip ends. See NPC movement. To also turn off its sight, talking and speech while the clip plays, take over the NPC with NpcControl.Take(modId, npcId). See NPC control.