Spoiler for ep20 preview summary:
Madder Red Battle to the Death
Shana and Wilhelmina meets up with Yuuji, who had figured out Zarovee's plan and completed the foremost plan with his own powers.
But without a moment to rest, a new attack strikes the three.
Numerous blades carves into Shana's body, and Wilhelmina and Yuuji are swallowed by a giant, madder red colored flame.
That happened in a moment and at the same time.
And a sword is thrusted into chest of Yuuji, who stood on top of the rubble the destroyed shopping district.
The owner of the sword was "Breaking Sword" Sabrac.
Zarovee inviting Yuuji to the business district, Bifrons aligning his movements with him, all was just a trap created by Sabrac.
Hiding his presence, he taunts the three flame hazes, Wilhemina, Margery, and Shana, as their wounds enlarge with time thanks the Unrestricted Method controlled by the enemy "Stigma".
Looks awesome, sounds awesome.
...
Then again, Zarovee's fight with Yuuji in the OP looked like it could be good... but it was rather simple in the actual event...