Another built-in, and perhaps even more dynamic way to do this, is via the AI Perception Component and corresponding Perception Nodes. Your Weeping Angels pawns would have a Perception Component added to them, and be possessed by an AI Controller. This would also enable Navigation System tools, so your AI could easily make use of pathfinding nodes like Simple Move To Actor and Stop Movement. You could even utilize Get Move Status to do something when the AI reaches the player.