[RallyJeff]

I can speak a bit about replays in general terms. This is my second season as a head ref.

- fouls don't result in replays. Instead, they result in penalties ranging from a simple foul to a red card for the entire alliance depending on the particular rule and how it was broken.

- the head ref is the one who determines whether an arena fault has occurred. In practice, for many arena faults (e.g. control system issues), the FTA will be the one to identify the problem. When everyone's working well together, the head ref's "determination" might be a quick nod of confirmation to the FTA or scorekeeper who has their finger on the shutdown button ready to press it.