>>719025424
1: Every plasma weapon has a magnetic field, How else do you think the plasma pistol charge shot would work?
2: The magnetic field travels WITH the projectiles. That is literally how all plasma weapons work in universe.
3: Even though the covenant are dumb as shit and actively chose to imitate forerunner technology and use it for it's basic purpose, and label any form of innovation as heresy, the forerunner tech is still really advanced and with their numbers, they're still a force to be reckoned with. 2500s humanity was on the back-foot for a reason.