As for Tronus drawing his sword and shield -- I think the nature of the mask you're under makes that hard to do. It's not a full Invisibility spell, so you'll need to remain still to remain camouflaged against the castle wall. But let's say you can try to draw your weapon for a Stealth check vs. RP + Blk?
That said, Nekurr's Triumph could be used to upgrade Hildar's Stealth check to hide, or Tronus's Stealth check to draw a weapon unnoticed. Or a narrative use, of course.
Here's where we are:
Hildar: Give me a Stealth check vs. RP + Blk, with a boost.
Tronus: Give me a Stealth check vs. RP + Blk to get either the sword or the shield out without breaking the mask. Or just wait to see what happens if you'd rather not try that.
Nekurr's Triumph can be used to upgrade either of these checks, or for a narrative use.