Harry and Ron acted one after the other, one defending and the other attacking, turning the tables on the three Death Eaters right from the start.
The Spirit-Burning Fire unleashed by the Saladin Lamp Demons forced all three Death Eaters, including Dolohov, to dodge quickly.
Dolohov in particular had let the Spirit-Burning Fire get close. At that distance, it could already interfere very effectively with his use of magic.
Spirit-Burning Fire was a remarkable thing.
For an ordinary wizard, using it truly meant dealing a thousand points of damage to the enemy while taking eighteen hundred themselves.
This magic made no distinction between friend and foe. It burned magical power on Dolohov's side, and it would do the same on Harry's side. When a wizard used it, it would burn through a large amount of their own magical power the instant it was released.
As a result, almost no wizard would use this magic.
That was also why, when Ron used it, Dolohov never even considered that it might be Spirit-Burning Fire.
However, although Spirit-Burning Fire could erode the vast majority of magic and burn magical power, it was not impossible to stop.
First, as a flame, it could be controlled directly with a sufficiently skillful Fire-Control Charm.
Of course, that depended on which side was more skilled with the Fire-Control Charm.
Second, fire-based magic would not be eroded by Spirit-Burning Fire.
Right now, for instance, Harry was using the Fireshield Charm to protect the four of them. Even when the Spirit-Burning Fire passed over them, it did not affect them.
After discovering that his opponents were using Spirit-Burning Fire, Dolohov also wanted to resist it, and he knew how.
To give him his due, Dolohov was a highly accomplished Dark Wizard. He should have had no trouble dealing with