Re: i. THE TRIAL
Matt (and I'm assuming Jen and Foggy) is helping to facilitate the trial, by asking questions and leading things along. He's aware that it's a trap, but he still wants the proceedings as far as questioning is concerned to be fair.
Erik is at the back of the gallery, listening and waiting for his moment -- and upon receiving his cue he causes the wand to hurtle away from Jadis and across the gallery into his hands. It's a tempting thing to keep, but he'll respectfully return it to Edmund.