Since Deathstroke knew Faltine was no match for Dormammu, having her do something like blocking the door was really just for show.
Displaying the plane of fire was meant to lure Dormammu into using spatial abilities.
Of course, Faltine herself did not know that. She still thought the plan had failed. After the Mirror Dimension unfolded, she launched several more futile attacks at Dormammu, looking somewhat flustered.
Su Ming had no need to explain the full plan to her. Even Umar knew only half of it.
The two of them had promised that Dormammu could not access their thoughts, but... never trust a stranger. That was absolutely one of a Mercenary's rules.
The three Demon Gods present were all Faltinians, while he alone was an ordinary human. Wasn't it perfectly normal to take precautions?
Besides, once Dimensional Demon Gods began fighting, the spatial fluctuations they caused could even affect the First Dimension. Within layered Mirror Dimensions, it was like having buffer zones.
Su Ming did not want some Old Ones to pop out from nowhere to watch the show while everyone was fighting fiercely, then reap the benefits from all of them. Isolating the space was merely the first step of the overall plan. It would not only ensure that no one could leave, but also prevent outsiders from entering for a short time.
Umar's task was to battle Dormammu with magic and create a favorable environment. In truth, an environment of fire elements was not friendly to Su Ming. Strangle did not like places that were too hot.
Though it was much stronger than other Symbiotes, fire-based abilities could still threaten Strangle.
Faltine's Fire was the exception. Her flames were not hot enough; they could not even roast a whole lamb properly.
With another spell from Umar, the surroundings,