Mario's filmic function — "so the staff can show the…"
so the staff can show the tapes to the kids instructionally, letting the kids see on the screen exactly what a coach or prorector’s talking about.
Context
Carlisle pairs this section deliberately with the attaché's, one section earlier: Schtitt can use an isolated moment of Mario's film "in a recursive loop" to instruct students — the death-loop's own phrase turned redemptive, spectation-as-care set against spectation-as-trap, the two uses of the lens ending the chapter side by side. The loop phrase is his, not DFW's, so the pairing is recorded here on his authority with only DFW's actual words quoted.