Erik was tense under Charles' hand, vibrating like a live wire, as if he were ready to pounce at a moment's notice. Though he knew better, from experience, that jumping Shaw wouldn't just get him nowhere, but actually somewhere less than nowhere.
His mind, however, was in overdrive, scrabbling to come up with a plan, he had the seed of an idea, but he couldn't be sure if it would work, and for all of them to get out of this alive the timing would have to be perfect.
He eased forward a half-step, tugging free from Charles' grasp on his arm, his voice was still more than a little rough, but it was audible and clear, "I'll stay. Just let Charles go."
In that moment he knew exactly how this would have to play out. They'd need to sacrifice one of the snowmobiles to their cause, but it was a small price to pay. If he could move fast enough, and he knew he could, he could trap Shaw with the frame of the vehicle he was lounging against, Emma, since she was closest, would have to get the helmet off of him, and he knew she could move quickly enough to do so, he'd seen her in action after all, which meant that Charles would have to freeze the other man as soon as he had the chance to.
In other words, they were going to have to work together, like clockwork, as if they'd practiced it a thousand times. Images, he knew, were easier to project than words, and he'd given both Emma and Charles the same sequence, he just had to believe they could actually pull it off.