Originally Posted by RustyCage
He fires it at one of the motorcycles, but an EMP wouldn't shut down a motorcycle (they certainly didn't look like electric bikes), so I'm guessing he was aiming for that little tablet he picks up later to shut off the process that he wound up being too late to stop.
This is assuming he knew about the tablet before he picks it up from the thug later, of course.
Otherwise, it doesn't make any sense to fire it. It just makes a bunch of ineffectual sparks.
using it to stop the bikes. An EMP burst would (potentially) disable the electronic components of the bike that help make it run.