Antilabe

Antilabe (from the Greek: ἀντι "mutually" or "corresponding", λαβή, "grip" or "handle") is a rhetorical technique in verse drama or closet drama, in which a single verse line of dialogue is distributed on two or more characters, voices, or entities. The verse usually maintains its metric integrity, while the line fragments spoken by the characters may or may not be complete sentences. In the layout of the text the line fragments following the first one are often indented ("dropped line") to show the unity of the verse line.
These are three sentences spoken by two persons. But it is only one single line in blank verse:
In Ancient Greek drama.
"The device originated in classical tragedy as a means of heightening dramatic tension." "It figures in almost all the plays of Sophocles and Euripides. It renders dialogue less stately and more agitated: the technique is well suited to scenes of excitement, in which one speaker is repeatedly capping, countering or following up the ideas of another." In Sophokles’ "Oedipus", for example, "as "Kreon" seizes "Antigone" (832), they break into an excited lyrical strophe, full of "antilabe" in which "Oedipus", "Kreon", and the chorus participate." "In "Electra" (1502-3), "antilabe" occurs as "Orestes" tries to induce "Aegisthys" to enter the house so that "Orestes" can kill him." "[Antilabe is] used with particular freedom in late Euripides." "In the plays of Aeschylus, with the possible exception of "Prometheus Bound" (line 980), this phenomenon does not occur." 
In Seneca drama.
"Dialogic exchanges using both "stichomythia" and "antilabe" are common in Seneca. They occur in all the tragedies except "Phoenissae"."
In Renaissance drama.
David Eggenberger notes that "[the device] was frequently utilized by Renaissance dramatists."
An extreme example from Shakespeare is: