What is Antonio's doing when Odysseus shoots him why is he the first?

Antinous, not Antonio, is the one shot by Odysseus in "The Odyssey" for plotting against him. Antinous is the first suitors to be killed by Odysseus because he is the ringleader of the suitors and the most aggressive in his behavior towards Penelope and Telemachus. His actions make him the primary target when Odysseus takes his revenge.