You gesture at Rhetburb.
The mana you were holding contributes to the spell.
A small ball of flame flies at Rhetburb!
The fireball blasts into his chest, nearly tearing Rhetburb in half!
His skin blisters as the intense heat of the fireball washes over him!

A passerby runs off, screaming for the militia to arrest Dual on the charge of murder!

A troupe of guards come riding up on some splendid Clan steeds! The leader says, "So we've found you, Dual! Time to pay the price for your crimes!"

Without warning the guards manacle and chain you, kick your feet out from under you, and lift you onto a horse. The guards ride you back to town, through the city gate, and into the guard house.

[Guard House, Jail Cell]
From the stench here, it is apparent that the guards have little interest in coddling criminals. Mounds of musty-smelling hay have been pushed up along the walls, though it is impossible to imagine sleep as a viable possibility here. You also see a barred window, a heavily barred door, and a mound of smelly hay.
Obvious exits: none.

* Rhetburb was just struck down!