Probably be able to take a few shots, but those legs/lower body look exposed and it's not like Jango doesn't also have a rocket which has a decent explosive radius, which could send a few off the platform or incapacitate. Also his jetpack takes off pretty quick, so not sure they can reach him.
Depends on whether his blasters can pierce their armor. Even without that he could potentially end the fight in an instant if he uses his rocket on his back.
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It's honestly really tricky. Judging on the equipment and stipulations, all logic dictates what Zenwolf says, Jango can just rapidly take off into air and bombard them and win.
But then, can I imagine Jango pushing Kylo and Rey to their limits? Not really.
Also those guys are fast enough to keep up with these two, so is it illogical to think that with such a number advantage and epic reflexes, they could potentially reach air-hovering Jango? Nah, not really.
Well Jango can fly into the sky and shoot a missile taking a few put minimun.
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The Praetorian Guards are basically Snoke's version of the Imperial Guard. They simply are component warriors and show no signs of force sensitivity. Furthermore, even if they somehow have the reactions capable of doing so, their weapons seems completely ill suited for deflecting blaster fire. Jango curbs them.