A handling error, this time by Anthony Stewart on the Reds' 30-metre line, gave the visitors a great attacking position.
A handling error under pressure from Richard Whiting conceded the position from which Fetuli Talanoa crossed on the left, and then indiscipline gifted a penalty from which Jordan Rankin stepped through some sluggish try-line defence.
Philadelphia and LA Galaxy shared a 2-2 draw in a pulsating match that featured excellent goals from Robbie Rogers and Mike Magee, one debut strike by Keegan Roseberry, and a bad handling error from LA keeper Dan Kennedy.
Another handling error, this time from Robbie Paul, then gave Graeme Horne an intercept try from halfway and, for the first time, Hull had some daylight at 18-8.
Our stats guy just told me that they had just one handling error in the second half, so we had to do something right to get some points in the second half.
The first came from a header, no more than a yard from the goal line, when Inzaghi sensed the rarest of things — a handling error from the World Cup-winning captain, Iker Casillas.
Sexton slotted his fifth penalty before replacement lock Taofifenua touched down unopposed after the visitors, despite making handling error after handling error, eventually found a way through Ireland's defence.
A handling error by Tansey led to Swift's opening try in the left-hand corner, and Percival added the extras.
The Vikings had a chance to get on the scoreboard when Hall's handling error gifted them possession close in but they were unable to capitalise.
Green completed the scoring following another handling error as Widnes missed out on a last-four place in the Challenge Cup for a 17th consecutive year.
But a Wolves handling error allowed the home side to respond almost immediately, with Oldfield crossing in the corner and Thomas Bosc adding the extras.
