Mistless Imperial Palace
In the Imperial Palace, one is normally blocked from heading straight to the Emperor's bedroom by a pair of giant brooms. In order to pass these brooms, Veil of Mist must be used, which you must backtrack to obtain. However, if you get Fireburst Early, you can use it to bypass the brooms instead of VM, due to Fireburst Slowdown.
This is only useful in NG Any% routes which obtain Fire Tablet, but perform City Checkpoint Skip. It's not useful in routes which obtain Inferno, as the extra time taken to do Fireburst Early outweighs the time saved by skipping Veil of Mist.
When Veil of Mist is skipped this way, you must defeat Blight without it. You must also defeat the gold cannon in Wawku Shrine with Fireburst Slowdown.