No I don't believe he started the car just that on pouring the last drop of brake fluid in he'd realised what he'd done and got in a bit of a panic . I've since calmed his nerves a bit with the earlier replies .
I was browsing the threads and saw your leak issues .
I have a 2005 Focus 4dr and had this problem a few years ago . In my case the aperture in which the black plastic vent fits into on each side of the car (just opposite end to where your arrow is in the photo) was at fault . Fixed successfully with a generous helping of silicone sealant but it took a couple of attempts .