Tapping an untapped creature that's attacking or blocking to convoke a spell won't cause that creature to stop attacking or blocking
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Its capable of generating 2 mana for expensive cards only, it takes you from 3 to 5+ mana quickly, and it can even be a looter to go through your deck and find whats needed
The Temur decks also leveraged the flexible two-for-one effects of Rogue Refiner and Whirler Virtuoso as bodies that can fill a battlefield, draw into more cards, or in Virtuoso's case, provide an evasive win condition by converting Energy into flying thopter tokens
If you suspect that this is occurring, please bring it to the attention of the auctioneer