The Italian side appeared set to take all the points from a closely-contested encounter but O'Donohoe crossed after the hooter to pull the score back to 23-21, and Dan Parks duly added the extras from the conversion to ensure the draw.
Fetu'u Vainikolo had earlier crossed for the opening try of the contest, but Edoardo Gori's effort and a late penalty try appeared to be enough for the Italians until O'Donohoe's dramatic intervention.
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