July 28th Rene and David make port in London - Encounter 1

There was one final bit of influence Quinn needed to exert over this battle, but considering the nature of her weapon it was much less of a guarantee. Still, if she could pull it off she would have another useful tool, and it would help to placate the Ministry. She brandished her fiery left hand, and spoke once more in tones of command and ancient magic.

"Your prey holds a weapon of great power in his hand. It cannot hurt you. Destroy the prey. Do not destroy the weapon.."

There was little in the way of acknowledgement, but that was to be expected. She could communicate with the beast in a limited sense, but its intelligence was nothing like an actual animal. She could only do battle with its will, force it to express its power and destruction exactly in the way she wished. This was not an exact science, but she had trained herself for years to redirect the torrent of flame and ferocity that was embodied by Fiendfyre. This was a real combat situation, the first in years, but as the beast prepared to make its final attack, the bond felt strong. She was in control. Now it was all a matter of timing.

Watching carefully with her telescopic-vision spectacles, Quinn aimed her wand at what was soon to be the corpse of her enemy. One final set of muttered, repeated incantations, "Accio wand, accio wand, accio wand, accio wand", and it was done. The beast had, in the end, lunged upon the back of the panicked, fleeing mage. In the mere moment between the enemy's torso being vaporized and his outstretched arm followed suit, one of Quinn's summoning charms took hold of his wand. At incredible speed, the wand escaped the torrent of flame and found its way to its new master. As it floated before her, it seemed to be almost quivering, and upon closer inspection the wood had been badly scorched by its momentary exposure to the heat of the Fiendfyre beast. In one or two places, the wood had been burned all the way to the core. It would need to be repaired before it could act as one of Quinn's backup wands, but it would be able to produce a Priori Incantatem effect, and that was all that mattered.

The Fiendfyre beast was beginning to prowl the street for additional prey, slowly growing larger with each passing second. That was going to attract the wrong sort of attention, if she didn't put it out quickly. She strengthened the muggle-repellent charms she had quickly erected to replace the enemy's, and turned to her weapon.

"Your task is complete, great one. Return to whence you came, and soon you shall be rewarded with a feast to rival any I have provided you. Return. Return...."

She slowly increased the commanding tone and volume of the word "return", fighting the second battle of wills with the creature. Enticed by the promise of further meals, cowed by the voice of its summoner, the beast slowly, ponderously backed down. Its size was reduced, and it became little more than a serpent or ribbon of flame, slithering across the street to the ritual basin that acted as the conduit for its summoning. Quinn pointed her wand at the basin and spoke the ancient, nigh-unpronounceable incantation that would break the fire spirit's connection to the mortal plane. The snake became an ouroboros, consuming itself from back to front, and as she spoke the final syllable, the creature vanished entirely. The bowl was empty of its previous contents, the fiery glow of the runes on the basin and Quinn's hand faded away, and the flaming light behind her eyes was extinguished.

"That went well," she said quietly to no one in particular. The street was a mess, but there was little evidence that she in particular had been there. It would have to be enough. She had the enemy's wand, if she needed to prove her story to the Aurors via Priori Incantatem. Barely glancing at the remains of the unfortunate former Death Eater she had just defeated, Quinn cast homenum revelio and a few other detection spells. As far as she could tell, no Penrose. No nosy muggles. No Aisha. No Mary. No further vampires or other allies of her enemy. That was good. It meant she could leave. 

She collected all of the implements that had been used in the summoning, the empty basin and the empty pouches. In a quarter of a second, she was back on Mary's street. The debrief for this mission would be a bit contentious, considering Aisha had left her for dead without a second thought...

[Collecting the wand was not guaranteed: see the Discord dice-roller thread]