Why is Partridge at the 5570 West Huron the whole time the surveillance is active in 6x01?

The reason I say he was there the entire time tracking was active was these screen shots.

http://imgur.com/a/PLbyg

The screen is show first when Van Pelt first contacts Lisbon to say the tracking is active. The second time is when Lisbon was in her office and got the call directed at her unit. This should the entire time that tracking is active in this episode.

So Brett Partridge was at that house for a while? but why?