From section 2.2.1
Quote:
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A protective safety net extends above the top of the ALLIANCE WALL to prevent GAME PIECES and/or ROBOT parts from exiting the FIELD and entering the ALLIANCE STATION area.
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Based on this I would say that the Ubertube on the net was still 'on the field' and in play. Someone in the alliance station knocking it off the net should garner a <G58>. I agree with how it played out at IRI.