Round 1:
The Teifling Monk/Rogue/Swashbuckler/fighter realises that being stuck in armour is a bad and asks the Cleric/Contender of Kord to break him out, and holds his action.
The Fighter/Wormhunter makes a double move diagonally round the troll to try to reach the weapon rack.
The Cleric fails DC28 Strength check to break the Teifling's armour.
Teifling moves 40ft towards Troll (he's now closest to it)
Troll, being a simple creature charges the Teifling and promptly his him for 21 damage, the teifling isn't knocked down.
Round 2:
Fighter moves past troll, misjudges its reach and his hit by an attack of opportunity for 24 and is knocked down. he crawls the remaining 10ft past the troll.
Cleric moves forward and successfully sunders teifling's armour.
Teifling tumbles forward and attacks troll while fighting defensively and using combat expertise (AC31) deals 13 damage.
Troll full attacks Teifling but miss all 3 times.
Round 3:
Fighter reaches Weapon Rack with a choice of the following weapons:
Dagger
Dwarven waraxe
Scimitar
Spear
Longspear
Bastard sword
2 Shortswords
Rapier
Glaive
Greatclub
Longsword
Maul
Greataxe
Light mace
Flail
Cleric moves round the troll towards rack carefully staying out of it's reach.
Teifling uses his darkness ability on the troll.
Troll full attacks Teifling again and hits once knocking teifling down and taking him below half hp.
Round 4 and following
Meanwhile the Fighter hands cleric a great axe and takes the bastard sword.
The Cleric charged the trolls side using his feat of power (taking him to STR 40 for this round only) and promptly missed due to darkness.
once they surrounded the troll the teifling could sneak attack every round and it went pretty much their way after that, the darkness continued to help and hinder them.
The fight ended when Teifling ended the darkness stopped being defensive and flurried dealing ~120 damage