In the second quarter, Rivers connected with Gates at the two yard line, and Hobbs caused an apparent fumble, which Vrabel recovered. Schottenheimer challenged the ruling on the field and won. The play was ruled an incomplete pass (and the Chargers got a TD a few plays later). But, when I saw the replay it most certainly looked like a fumble. While I think the refs were pretty even handed in this game, their decision to overturn the fumble really surprised me. Any idea what evidence the refs had to overturn the ruling on the field?