This paper discusses problems of staging, address and word order in Greek tragedy to shed light on a controversial passage in Sophocles: Aj. 339-343. Ajax’s cry within, ἰὼ παῖ παῖ (339), has been alternatively taken to refer to Eurysaces (as suggested by Tecmessa) or to Teucer (whom Ajax mentions at 342-343). The paper argues for Teucer and responds to three arguments against this view: (1) παῖ is not only acceptable, but also effective to address one’s sibling; (2) the word order of 342, Τεῦκρον καλῶ, strictly implies ‘It’s Teucer I’m calling’ (not just: ‘I call on Teucer’), hence it cannot mark the move to a new addressee; (3) it is hardly possible for Ajax not to hear Tecmessa’s 340-341: short interactions across the skēnē door may occur, and the parallel scene at Euripides, Medea 1270a-1278 suggests that Ajax most likely hears Tecmessa’s words and corrects her wrong guess.