Michael heard Jessie and Jack arrive, and he thought Jack was wise to have Jessie distract the troll while he freed Michael. When Jack moved the display case, Michael felt sharp pain in his spine from the release of the pressure. He had tried to brace himself for it, but it still hurt. Still, he was grateful for the rescue.
"Yeah," Michael said. "Yeah, I'm fine." He made it to his feet, but not without some difficulty. The sharp pain still told him something was definitely amiss. The severity of the pain told him he was going to have to have Robert see to it. "Thanks, Jack," he said, still relieved to be out from under that display. He looked at the troll, and it still had that black crystal. Michael wanted it, but he knew he wasn't up to a big skirmish with a troll.
"Listen," he told Jack, "That's our sorceress. and I want that bauble she has. I'm going to get it, and then you lads do whatever you want with her." I have all the important jewelry pieces from here already. I"m going to step back and let you two handle her. I don't think I'm going to be much help." He stepped backwards a few steps from Jack, and as he did, he used his medallion to send a signal just to Robert, uncertain how long he could stand up with the pain he was having.
Robert apparated in, wand drawn and at the ready. He saw the troll, but he saw Michael who was trying to use a doorjamb to keep himself upright.
"Michael!" Robert braced up Michael, feeling Michael starting to crumple underneath him.
"Get that thing!" Michael pointed at the troll.
"The troll?" Robert frowned.
"No, the stone. Get the stone," Michael said.
"That?" Robert pointed to the glowing black crystal.
"Yes! Get the stone!" Michael repeated. Robert cast a spell and got resistance from the chain, as if someone had tried to make the chain unbreakable. Well, that hadn't stopped Robert before, except for Khaat's necklace. He cast a spell to break the chain and then summoned the stone. It flew to his hand, and he tossed the thing unthinkingly into his pocket.
"You need help with that big gorilla, Jack?" Robert called to Jack. "Or have you to got him?"
"Her," Michael said "That's our shapeshifter."
"Ah! Jack! Transfigure that hussy into something else!" Robert shouted at him.