Joshua 22:1–34 describes the dismissal of the eastern tribes (Joshua 22:1–8), their journey home which includes the building of an altar (Joshua 22:9–11), as well as the resulting actions of the other tribes and the dialogue between the leaders of the western and eastern tribes (Joshua 22:12–34).
Within the chapter, the dialogue and events immediately around it can be arranged according to this pattern:1
a) Transjordanian (eastern) tribes build an altar (Joshua 22:10)
b) Cisjordanians (western) tribes threaten war (Joshua 22:12)
c) Cisjordanians send an embassy (Joshua 22:13–15a)
d) Accusatory speech by the embassy (Joshua 22:15–20)
e) Transjordanians’ reply (Joshua 22:21–29)
d’) Accepting speech by the embassy (Joshua 22:30–31)
c’) Return of the embassy to the Cisjordan (Joshua 22:32)
b’) Withdrawal of the Cisjordan threat of war (Joshua 22:33)
a’) Transjordanians name the altar (Joshua 22:34)
Given the fact that the Transjordanians' reply is at the centre of the chiasm (above), this would seem to indicate that their reply is the focus of Joshua 22:10–34.
1 At that time Joshua summoned the Reubenites and the Gadites and the half-tribe of Manasseh,