ἔστι: ἔ. in this position is never otiose. Often=ὄντως ἔστι. “In truth it is.”
ἀνδρί: Not differentiated from ἀνθρώπῳ. So often in poetry.
ἀμφί: A favorite preposition in P., esp. with dat., little used in prose. In the sense of this passage περί is more commonly employed even in P.: ἀμφί, being the narrower, is the more picturesque.