The entrance blocked, being the only main entrance, is indeed your exit route.
You won't be able to do any jamming from your ships- your efforts would be far to weak. Even if you are very technologically competent, to jam that thing you would have to be at pointblank range.
One Osokans team is going after Xorn now. Those at the warehouse, there are three teams- two up in the branches, and one sealing the way out. Rogan is also with the sealing team.
"Hey, Rogan, glad you could join us!" Galder shouts, grinning maliciously. "I don't know why you're here though. You won't catch us."
Galder twirls his lightsaber about idly in his hands.
"Let's charge 'em," he whispers to Rand, walking up alongside him. "They're blocking our entrance, we'll make them move!"
"Shut up!" Rand says, hissing at Galder.
He holds his lightsaber out in front of him defensively, using Iron Will and Sense to see if he can pinpoint any other teams nearby.
"Guildmaster Rogan, you are quite a skilled individual, it would seem. We gave up on trying to lose you, as you may have noticed. Your heightened sense of smelling is too great for us. Your eyes have followed us, and yet evaded our own. Surely this will be a great hunt for you, yes? Unfortunately, you will not be taking any skins, scalps, or mounted skulls back to Lanzar, and our lightsabers will remain with us, not as your trophies. But, why Newhaven? Of all the places you could be going, what tipped you off? We were as careful as possible."