Is Telekinetic Armory subtle enough that onlookers might not realize that the assailant is harming someone else? For example, could a Telekinetic in the middle of a crowd generate Mind Bullets and shoot down a yak 200 yards away without anyone realizing that it was telekinesis?
(Despite the quotation of Tenacious D's Wondery Boy, this is a legitimate question, I'm not sure if it would be subtle or obvious, and if it is obvious: I'm not certain how it would be obvious, exactly.)
Yes. As written, TK Armory is silent and invisible. You can skin it however you like though.
It absolutely is. I'm not sure how much I like that, but the description of the Telekinesis discipline does imply that it's possible to detect the manipulation.
Which is nice.
It depends on how you want TK to work. I don't like "bullets of the mind", and I have the psychic in question hurl things with the character's brain for 1d10+2 damage (plus attribute bonus). This definitely makes it more detectable. Then again, a pebble launched at high speeds is pretty hard to detect.
You can skin TK Armory as "Force Choke" too...