If only Boba Fett would have left Luke Skywalker to the whole barge full of people he was fighting, he could have killed the unguarded Han Solo, taken down Chewbacca as a bonus and zoomed away.
Yet there’s Boba getting his blaster chopped in half by Luke’s lightsaber, only to be further humiliated by a half-blind Han Solo.
But Luke Skywalker, a somewhat experienced Jedi Knight, is an obstacle between Boba and his target.
If it was just Han on that barge he landed on, I could see merely taking aim at his target and calling it a day.