The home side regrouped and, on the stroke of half-time, Marc Bridge-Wilkinson struck a 12-yard shot with venom, only for Ankergren to save.
On Wednesday she had to drive 18 miles to see him instead of the normal half-mile drive over the bridge to where he lives.
The Giants now trailed by just six points but Warrington increased their lead six minutes before half-time when more slick handling between Bridge, Mathers and King created the space for Aussie winger Hicks to score.
And it was the visitors who took control early in the second half when Bridge released Matt King, whose right-wing burst sent through Jon Clarke.
Marc Bridge-Wilkinson's second-half strike was the catalyst for the fightback.
But Barcelona's attacking brilliance cast a shadow over the mood of celebration inside Stamford Bridge - and they were back in charge of the tie before half-time.
The strongest tornado, rated a maximum EF5 on the Fujita Tornado Scale, tracked for nearly an hour and a half along a 38-mile path from Chickasha through south Oklahoma City and the suburbs of Bridge Creek, Newcastle, Moore, Midwest City and Del City.
Hull deserved their point and could have come away from Stamford Bridge with all three had Craig Fagan and Dean Marney not missed second-half chances.
The bridge will also provide the final link completing the six-and-a-half mile (10.5km) circular Bay Edge Walkway and cycle route and connect it into the Vale of Glamorgan.
He raced to his half-century off just 36 balls, a week after taking 69 balls over his 35 at Trent Bridge, albeit on a wicket that gave batsmen full reward for their shots.
When Singapore refused to replace the causeway, he proposed demolishing the Malaysian half anyway and replacing it with a bridge, even though the limited space would have necessitated a wonky, dog-leg design.
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