The "priest" commences casting, a thin piece of metal in his hand.
With style and panache, Haldan drops down, rolls, and reaches for the downed bugbears weapons, tossing back towards the door the 8 foot long spear and morning star. Both weapons were a little large for the diminutive halfling, but at least he could supply others while simultaneously disarming the downed opponent.
Snatching up the morning star, Amathaon swung wildly with the unfamiliar weapon, narrowly missing the somewhat startled ogre. The ogre in turn swipes back at the dwarf, missing by a mile.
The "priest" completes his spell and tosses the pin at the Prince, then curses as it bounces off without apparent effect.
Luthien, seeing the spear at his feet, snatches it up and thrusts past Amathaon at the ogre. He's somewhat less than successful however with his attack, the spear thrust going wide.
The bugbear Rolf tackled struggles to catch their breath and break free of the mercenary's hold, but somehow Rolf held on and kept the larger opponent on the ground!
The second bugbear squeezed past the ogre and assaulted the prince with his flail. The prince caught the flail with his sword, but the flexible weapon still swung around and hit the prince heavily. An instant later and the prince skewered his attacker on his blade, inflicting a grevious but not fatal injury.
New round. New initiative rolls and state your intended actions.
I took a few liberties but hopefully nothing too dissimilar to what you might have chosen as the situation evolved.