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Di la fosti cotanto quant' io scesi;
quand' io mi volsi, tu passasti 'l punto
al qual si traggon d'ogne parte i pesi.

Word:

volesti

Question:

Why does the speaker turn around and notice someone passing the point where all weights converge from every direction?

Answer (optional):

The speaker turns around and notices someone passing the point where all weights converge from every direction because the person has arrived at the point where the speaker and their guide descended into the abyss.