Grian is frightened, has no weapon, and he’s significantly smaller. The vex should be able to take him down easily.

So eventually they reach this sort of neutral state of neither of them moving any closer. Grian creeps along the walls and eventually, slowly, settles himself down to sit to rest his poor shaking legs. Scar stares for a moment longer, then also sits, still watching.

Grian figures maybe as long as he doesn’t provoke this beast, he’ll be safe.

(And it's true. Scar is used to people coming in here to steal and demand to make deals with him. Grian clearly didn't mean to be here though. But he's keeping a watchful eye. He doesn't trust it.)

Eventually, Grian thinks maybe the vex is asleep. So he takes this time to meditate. His real eyes close, and hee opens his Eyes to try to determine if the Watchers are on his trail yet, reaching out as far as he can to Look.

When he opens his real eyes again, Scar is directly in front of him, staring more curiously, sort of like he’s wondering if his intruder just died whilst sitting up straight.

Grian yelps and bonks his head on the wall trying to scramble backward.

But Scar also yelps (although muffled) and flails back as well.

And despite everything... Grian can’t help but laugh at that? Because why is he startled? 

Now that he’s closer, though, he can make out the Watcher’s symbol on the lock of the cage on Scar’s head. And being spiteful of anything the Watchers might do, he reaches out without even really thinking about it. 

Scar freezes.

He lets Grian touch the trap around him, but he still doesn't know for sure this isn’t an elaborate trick? Something to get close and take him down? It would have been Grian's only way of winning, truly. So Scar places a clawed hand close to Grian's neck. He's slow and soft with the touch, but it’s undeniably threatening. If Grian was going for some kind of trap here, surely he'd flinch back?

But Grian swallows nervously and tries his best to reassure the vex that he wants to help.

And, eventually, Scar removes his hand and cranes his head to help Grian look at the contraption, also baring his neck, tentatively trusting.

Grian breaks the seal and slooooowly pulls the thing off of Scar, and oh Scar is so happy.

He grins, big and toothy (full of sharp edges, but it's still so oddly charming?) and grabs Grian to spin him excitedly.

He speaks now, (and oh if his voice isn't also so charming) and he lifts Grian up, looks up at him, lips far too close. "Oooh my gosh, I swear I could kiss you right now!" he exclaims, but he doesn't, a shame, really, and instead puts Grian back down and just starts excitedly introducing himself.

In this case, Vexes have like unlimited magical potential. But they are limited by only being able to use it under the direction of someone else. (thinking like how evokers summon them and direct them) The catch is, vexes are tricky creatures. They can and will warp your instructions to their liking if you leave any room for loopholes or leeway. That’s part of the reason Scar was gagged. To prevent him from swindling you into a bad deal.

So normally Scar would do whatever he could to bend the rules and screw over his master, but he’s so overwhelmingly happy at being freed that he says to Grian, “Anything you want! It’s yours. Anything at all, no tricks, no nothing.” And he means it, too.

And that’s all I really came up with! Like I said, just a beginning.