Excellent!
Perrin, fortunately, the troll does not kill you. Unfortunately, you are forced to dive out of the way. Luckily, however, the troll cannot climb the ladder or fit in the alley. However, your diving out of the way interrupts all the other stuff, minus your free actions.
Rhogar, you pull out the hand axe and shove the jewels into your pouch. You sweep them in before you can identify them, but your pouch isn't very heavy. However, the thieves are too far away to hear you. You run into the tunnel and make it as far s the halfling.
Cromwell, you dash forward and charge the troll, dealing a paltry 10 damage. Doesn't seem to be your lucky ten seconds.
David, you attempt to pull all that stuff off, but unfortunately, you do not have time to equip your shield, as it is a standard action. The troll reaches the end of the tunnel before you can do anything and you fail to bind it, but you do manage to apply the rune to Perrin, because he is right next to you.
Ezra, you apply the Curse. It hits the troll, as the bandits flee in a different direction. You reach the end of the tunnel and blast the troll with a powerful bolt of eldritch power. You deal... a whole 20 damage! (10 from hit + 4 Cha mod + 6 curse roll) That was lucky.
Gharahrn, you run into the tunnel and arrive next to Rhogar.
Keyleth, you dash into the tunnel and arrive next to the tiefling. The troll is already at the end of the tunnel, however.
Lastly, Damirion. You dash into the tunnel and budge your way between a goliath and a dragonborn, and cast Chill Strike. However, the troll is just to fortuitous to be affected by your cold spell. In addition, your spell backfires the tiniest bit, dealing the last bit of damage needed to annihilate the doorway, destroying the escape route in rubble. Your only way out is the ladder, which the troll is right in front of.
Battle!
Oh yes I did use an image recycled from the internet to represent a troll.
MEANWHILE
A guard stands in front of North Castle, shouting "BWAAAAAAAAAAAAAAAAAAAAAAAAAAAAH" in front of a Shardmind named Vulpec.