Shirou
Shirou cursed as the swarm suddenly charged at them, unexpectedly evading Sakura's attacks.
"Shit!" he shouted. "Sakura, stall them and run!"
Immediately, he summoned up as many noble phantasms as he could and began to rain them down on the oncoming enemies, whilst leaping backwards, taking care to remain in front of Sakura as he did so, his swords in hand ready for any close-range attack.
Sakura
"Erstellen Schatten-Vertraute!" Sakura shouted, taking a leap backwards as she summoned up multiple shadow familiars in a line in front of them, forming a wall between them and the onrushing attackers, a wall which would reach out to attack any which tried to avoid it. Meanwhile, another, much smaller one ran off to the side, bypassing the swarm entirely, and kept moving in the direction of the mansion.
Seeing that Shirou had safely followed her, Sakura pulled out a gem from her pocket, one which she always carried for emergency situations like this.
"Prime Bombe!" she shouted, throwing the gem just in front of the oncoming enemies.
"Explodieren! Schwarzes Loch!"
With that, the gem exploded, releasing a huge burst of energy, before collapsing in on itself, sucking in mana and magical beings in the vicinity. The swarm would feel a strong pull towards the point where the gem had exploded, which would sustain itself on the magical energy it was absorbing for a while.
Then, Sakura began to chant again.
"Diese Ranken werden dich verzehren, dich in den Abgrund ziehen!" she said, and several tendrils shot out of her, grabbing hold of Shirou as they continued to jump backwards.