"When you see the ass of your enemy lying under its burden and would refrain from raising it, you must nevertheless raise it with him". This would be, it seems to me, a covert reference: "the ass of your enemy" means the individual who follows the counsel of their evil inclination, which is termed "enemy", as our sages of blessed memory said, concerning "The wicked watches for the righteous". In other words, one who pursues the world's impure matter and follows the evil inclination's passions. Should you see such a person, sinking and collapsing under the burden of the evil inclination, and would refrain from raising him up – do not say to them 'what do I care? I leave you in peace'. "You must nevertheless raise it with him". Try to help that person and draw him closer to the Shechina's canopy.