The agent is expressed by different prepositions with the genitive:
ὑπό of persons and things personified ( cross1698. 1. N. 1): the normal usage in Attic prose.
παρά: here the agent is viewed as the source. The action is viewed as starting near a person, or on the part of a person.
ἀπό: indirect agent and source (rare) to mark the point of departure of the action. Chiefly in Thuc.
ἐξ: chiefly in poetry and Hdt. In Attic prose of emanation from a source.
πρός: to mark the result as due to the presence (
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].