Lethal Weapon ending explained (spoilers)

[RafaelDet]

McAllister and Joshua capture Riggs, Murtaugh and Rianne. Riggs and Murtaugh are being tortured but Riggs kills his captor and helps Murtaugh and Rianne escape. McAllister and Joshua get away. While Riggs chases Joshua, Murtaugh goes after McAllister. While driving away, McAllister is blindsided by a bus and a fire starts in his car, burning the heroin and getting dangerously close to the grenades nearby. McAllister meets his doom when the grenades explode. Meanwhile, Riggs intercepts Joshua at Murtaugh's house, where we presume Joshua was going to kidnap/kill the rest of Murtaugh's family. Riggs challenges Joshua to hand-to-hand combat on Murtaugh's lawn just as he arrives, with all the other cops watching. Riggs beats Joshua, who pulls a gun as he is carried off. Riggs and Murtaugh kill him. Riggs and Murtaugh are now best friends for life.