Robert
*Well that's helpful. Looks like he wasn't just spouting names, but would be better to confirm if it was really the person who hired him. In that regard a token would be useful, but would know better than to grab it barehanded. He would use his arms warps to carefully reach into the left pocket and pull out the trinket, and them examine it assuming nothing happens*
Peggy
The token is a black, polished wooden circle with an eeriely white engraving of an slim M in the middle. Fits snuggly into the palm. 
The sheriff walks over and takes a good look at it. "Well, that's their insignia for-"
The engraving started glowing. Not a good sign
Robert
*Mevis's eyes would go wide as be began to panic over the glowing letter. What's happening?! His brain quickly connected the fact that the merchant they were trying to deal with used runic magic and the strange wording on the lock in the room. By the gods, was this a trap?! Mevis would look over to the window to see if there were any civilians down below. If not, he would break the window and throw it down below, out of a fear that a massive explosive spell was going to happen. Of course, that may not be happening at all, and he would just look like a fool. But living life as a fool was better than living life with regret, as he wouldn't be able to mentally handle the Sheriffs, Belv's or even the assassin's death if this thing blew up in the room and killed one if not all of them.*
Peggy
"Look out!" The sheriff got that much out before Mevis moved to dispose of the rune. It flies out with the shattering glass and then combusted midair into a great blast of fire- roughly around that of an amped-up firestorm.

After that was done, the other occupants of the room were, in spite of their different personality traits, completely silent. 
Then the assassin broke the veil of quietude. 
"Well. Shit. When I can be ferried away into a safer place than this?"
At least he seems much more comfortable about his situation now.

The sheriff, on the other hand, picked his cigar from the ground, before commenting. "Some damn deft fingers you got there, and a very good thing too- even if any of us survived that one, our bloodsucking pal wouldn't have."

Belvador mutters some dwarvish curses, before look at the broken window. "At least n'un was there, or it would gotten real messy. The windows were a shame- were goddamn expensive even with the help of the innkeeper's glass mage friend, but it could have been worse... So good job. I'm sure he'll understand this mess." He chuckled.

You can see a commotion building out there as multiple townsfolk started to see what was going on, though quickly a few confused but upstanding lawmen helped keep the crowd away.

At the same time, an officer rushes into the room "Sir, what is-"
"At ease, officer. We've just dealt with the situation. Just keep the crowd calm and keep away from the glass shards for now."
As the officer rushes downstairs to relay the sheriff's orders, the sheriff takes a deep whiff of his cigar. It's clear to see that the whole case has taken quite the toll on him.
Robert
*Mevis would be breathing heavy and drenched in sweat. It was no more than a few seconds, but it felt like an eternity as he saw the glass breaking and explosion occur in slow motion basically, as if fate was intentionally showing him what would've happened to him if he was but a second slower. This... This wasn't the life he wanted to live. His legs wanted to give up beneath him, unsure how to handle the sudden change from relaxed, to stressful, and then back to relaxed environment. However, even as much as he hated these kind of situations, he couldn't leave it, as that isn't what a hero would do. He had to carry out his duty, his promise, and that meant he had to get shit together again.*

*He would take a deep breath and turn to the assassin again*

"Well, I don't know if there is any safe place for you so long as your employer is free to hire as many informants or assassins he wants to bring you down. Your best bet to save yourself is giving any and all information you got so that my guild can bring him to justice. As you can see, he isn't exactly looking out for your safety. So anything else you can give us?"
Peggy
The assassin sighed. "I wish. But really, that's all I have." And he seems to be entirely sincere since no vampire can be calm after watching a massive firebomb go off in their vincity- and was in their possession a mere moment ago.

Belvador frowned, before making a sideways glance at Mevis, nodding just a little. It seems that there wasn't much they could do now but take him for his word.