Star Wars: Rogue One Teaser Breakdown - 25 Things You Need To See

20. Back-Up Or A Third Party?

Although in the trailer it's edited to look like it's caused by Jyn's weapon, the explosion that sends the remaining Stormtroopers flying is caused by a remote agent, which could means she's not alone in her escapades...

...Or perhaps there's a third party involved - the way she dives out the way, dragging down Luna (from #JacketSpeculation I'm fairly certain that's him), suggests she wasn't expecting that.