Question about Darth Maul's final moment

So I was reading through the Star Wars website about Darth Maul, trying to figure out how he survived being cut in half in the phantom menace, at the end, the site says thatObi-Wan cradled Maul in his final moments. "Is it the Chosen One?" Maul asked. "He is," Kenobi replied. Maul looked up, the life fading from his eyes, and uttered his last words. "He will avenge us."What did he mean when he said "He will avenge us."?P.s. I've only watched the movies. via /r/StarWars https://ift.tt/2OudMc6