I would go back and load your auto-save. That should take you back to the beginning of the beholder cave.
What I did was send my best tank wielding the Shield of Balduran ahead of my party by about thirty feet. When he found the rod part, I immediately went to inventory, and moved it to my PC, who joined 'em together. He then used the boots of speed. To quickly move forward and blast the Beholder.
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