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You speak the words of the Brotherhood Spell Lightning Hand and point your right index finger at the iron pot. There is a flash of bluish light and then an arc of crackling electricity leaps from your finger to strike the top of the pot, blowing a fist-sized chunk of rusty iron out of its turned rim. One of the creatures is killed instantly by the blast and the other is stunned when the electrical charge is earthed along the supporting chain.
You sense that the surviving creature is only temporarily incapacitated; it will soon revive and it will be sure to attempt to avenge its dead companion by shooting at you with its bow. Mindful of the pending danger, you hurriedly examine the portal for a lever or some other means to make it rise.