When you have 0 ammo for your fusion rifle, sliding over a special ammo brick with slideshot and then right after trying to shoot will make your fusion charge indefinitely. It'll play the charge-up animation as long as you hold the trigger but never shoots any bolts.
I can post a video if needed, but it's really easy to replicate. It happens A LOT when using a fusion with slideshot and has in many many times caused me to lose fights.
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[quote]I can post a video if needed[/quote] Do that, they are not gonna care otherwise. [quote]but it's really easy to replicate.[/quote] And this is nice, but they want too see it happen before they spend time replicating it.