But it hardly interrupted the home side's rhythm - and the Owls found themselves under siege.
Owusu had a rare chance for the Owls but shot over from 18 yards.
Blackpool were made to pay for their poor finishing when Morrison gave the Owls the lead.
During the worst of the weather, staff fed the owls with voles and mice.
For the third successive match, the Owls failed to find the net despite enjoying much of the play.
The Owls also bring the star most likely to thrill the Brooklyn fans with a hot shooting day.
And did the legislation actually succeed in eradicating the other currencies and establishing the owls across the empire?
The former Hartlepool boss is representing a consortium in the Middle East who want to take over the Owls.
Great to have you with us and better days ahead for the Owls.
But the Lancashire businessman told BBC Radio Sheffield that he is confident of concluding the deal to buy the Owls.
McAllister, 23, joined the Owls Academy from Bolton in 2006, when he was named their Young Player of the Year.
The Owls went on the offensive after the restart, with Butterfield making an excellent header to cut out a cross from O'Connor.
The new information will also lead to habitat management for the owls.
Last week, it was revealed that a locally-based consortium was believed to be close to tabling a bid to take over the Owls.
Leon Knight's 58th-minute goal for Sheffield Wednesday had put the Owls ahead but former Norway Under-21 international Normann equalised 14 minutes from time.
Keeper Grant, 26, is a former England Under-21 international who also joined the Owls from Derby, signing a three-year contract in July 2007.
Sheard has also denied reports that he had decided to invest in the proposed Major League Soccer franchise St Louis rather than the Owls.
Most birds have extremely flexible necks, but the owls are the avian species that have perhaps garnered the greatest attention for their neck-twisting exploits.
The Owls enter on an 11-game winning streak, and they claimed their first Sun Belt tournament title and eighth NCAA tournament berth in Division I.
The 26-year-old, who scored the Owls' winner against Sheffield United in Saturday's steel city derby, still has 18 months to run on his current deal.
The Owls had suffered several other setbacks in their hunt for a permanent replacement for Sturrock, while academy manager Sean McAuley was in caretaker charge.
BBC: SPORT | Football | My Club | Sheff Wed | Laws takes over as Sheff Wed boss
Holloway, the club's sixth manager since Milan Mandaric took over as chairman in February 2007, must ensure his players do not dwell on defeat to the Owls.
The Owls looked set for their first league double over the Blades in 94 years with Adam Bolder heading the opener and then tapping in a second.
At some of the sites, wide margins of rough grass have been created near nest box sites to ensure the owls have enough voles to feed on.
But after Potter found the net from Daniel Jones's pull-back in the 15th minute, the Owls looked likely to add another before half time as the tide turned.
He had been in outstanding form in the first half of the campaign with 13 goals before the injury, sustained after he collided with the Owls' Gerald Sibon.
Tranmere moved above Sheffield Wednesday in the League One table following victory over the Owls on Tuesday night, leaving Les Parry's side enjoying the relative safety of 15th position.
The Foxes sealed the win when a superb team move saw the ball break to King, who finished smartly from 12 yards as the Owls slipped into the bottom three.
Nathan Tyson, recalled in place of Radoslaw Majewski, forced a low save with a crisp long-range strike while the Owls keeper did well to keep out a free-kick from Robert Earnshaw.
The Wednesday bench were also incensed by the decision and referee Trevor Kettle and his assistants were harangued by the Owls backroom staff as they made their way from the field at the break.
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