Rhys Jones began the move deep inside his own 22m line, passing to Lee Williams who whipped the ball out to Alex Webber under Wales' own goalposts. The Ystrad Rhondda rookie then threw the ball to Llanelli's Craig Price who worked an overlap for Allen.
The Cardiff Blues youngster flew down the touchline before dummying the last line of defence in the Fijian rearguard before romping home without any of the Fijians laying a hand on him.
Allen scored two tries in the first half along with Webber to put Wales 19-0 in front of the break in front of a packed Hong Kong Stadium but Fiji hit back in the second half with 26 unanswered points to claim victory against a brave Welsh performance.
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