QUOTE (ShadowDragon8685 @ Apr 13 2012, 04:42 PM)

I know what you're gonna say. "ZOMG CAMERAS!" To which I reply "Concealment" and "Redmond Barrens." The drone security are MCT Fly-Spies. They have a top speed of 15m/turn. Spirits of Air, when Materialized, have a top speed of 75 m/turn.
Sure, everybody will know, plain as day, what happened (except they totally won't, because again, concealment, so the crowd won't be going 'oooh' and 'ahhhh', or 'shoot it!',)
QUOTE (Tymeaus Jalynsfein @ Apr 13 2012, 05:28 PM)

Spirit grabs the 'Link and then uses Concealment to hide himself while he leaves.

EDIT: Which apparently
ShadowDragon8685 already said. *sigh*
Except that would require another service, most likely.
QUOTE (Eratosthenes @ Apr 13 2012, 05:34 PM)

A simple (mag)locked door would still prevent the spirit from leaving.
If you wish to make it easy for them, by all means, do so. Have the dressing room, unlocked, open to the outside. Don't have any form of magical defense (they can't hire a punk wiz-ganger for a day?)
You've got two mages, and no magical security. It should be easy for them. Just like it would be easy for a street samurai to invade an abbey of ultra-pacifistic monks.
If you wish to make it more challenging, there are ample things you can do (and have been suggested) to make it so.
This.
If you want to make things more challenging, it's easy to put up a low-force ward in the dressing room, a maglocked door (or even a standard lock! barrens after all...), and make it difficult to acquire a sufficient mental image of the commlink. Commlinks can be designed to look like almost anything, after all...
As for possessing the adept - and most every other use of a spirit's powers etc - it is never a given that a spirit will interpret it's orders in the way the mage intended.
"Stop that man" could be a use of Accident, Movement, Engulf, Unarmed Combat, Elemental Attack, or a Social Skill test. It all depends on the spirit.
"Kill those people" could easily affect innocent bystanders - including the friends of the mage.
"Incapacitate the security guard" may well require a test for the spirit to even know the concept of 'security guard', and again could be the use of many different powers and tactics.
A spirit won't necessarily choose to do something in a stealthy manner, or in a way that them age would consider obvious. They care little for metahuman ways and laws, and won't think twice about things like 'alarms' and 'cameras'. If it's been given an order it may not care about anything else (except protecting itself) and thus won't adapt well to a changing situation.
If the mage explains every step of a plan to a spirit, things will go better - but may require more services, a longer time to complete the order (vital in combat), or a ticked off spirit that feels like it's being treated as if it's stupid or can't think for itself. This may be enough for it to use Edge to resist the next summoning...
They shouldn't really be treated as metahuman entities when it comes to reasoning and knowledge - their frame of reference is alien, their desires and cares completely different from metahuman views, and they will likely pick whatever way of completing a task that is quickest and easiest for them.
Also, try giving the occasional NPC the Spirit Affinity or Spirit Bane quality to mix things up a bit.