Sneaking is all fine and good, at the right time and in the right place. By and large, though, Jamie's more than happy to take the more straightforward approach, especially in a situation like this one. His preparations are simpler than some of the others, as he's no mage or Warden. The only thing even vaguely magic-like he has is the shard in his hand, and while he's happy to blast something in the face with it if need be, that's more a spur-of-the-moment thing rather than something that needs to be set up in advance. All he needs to do for right now is bring up his sword, and shift his weight at the same time so that when the others charge he can be right there with them, which he does - and when Kain looks his way, he gives the other man a brief nod. He's ready when they are.