kiritsugu tracking device

It is dangerous to blindly take the bait and follow the enemy to a field at his advantage. But Saber isn't the frail type to fear such tricks, and her mistress doesn't underestimate her Servant either.

The marks of the enemy were getting more distant, and Saber started walking with a quiet self-confidence. Irisviel, following likewise, turned on the switch of a palm-sized device hidden in her pocket. This is a "transmission machine" entrusted by Kiritsugu, a device for him to follow the position of Irisviel's group from a different route. It is a mechanized gadget that works without prana that Kiritsugu intentionally chose.

- Fate/Zero: Act 3, Part 2