“The rest of them
Seized his slaves.
They mistreated them.
They killed them.”
οἱ δὲ λοιποὶ κρατήσαντες τοὺς δούλους αὐτοῦ ὕβρισαν καὶ ἀπέκτειναν.
This is unique to Matthew. In the equivalent parable, Luke did not have anybody killed or mistreated. Jesus said that the rest (οἱ δὲ λοιποὶ) of the invited guests were not indifferent. They seized the king’s slaves (κρατήσαντες τοὺς δούλους αὐτοῦ). They mistreated them (ὕβρισαν). Finally, they killed them (καὶ ἀπέκτειναν). There will not be a good outcome here. This may be a reference to the way that the Israelite prophets had been treated.