The Potters took the lead through Oussama Assaidi on the half-hour mark before Glenn Whelan and Marc Wilson were sent off prior to Loic Remy's leveller late in the first half.
"The team wasn't quite working as I'd liked, and I was looking to change it at half-time," he told Sky Sports.
"The sending offs changed it.
"We were as clinical as you could be in the second half."
He added: "We've got a lot of attacking options, which was nice.
"It was difficult for Stoke, and I have a lot of sympathy for their players. They were very professional, a credit to the game."
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