vs keyfob

I waited, and about forty five minutes later, the young woman left. A few minutes after that, Tripp Gregory emerged jauntily from his home, whistling, car keys in hand. He had to walk about half a block to his car. I murmured a word and threw up enough of a veil around me to make sure he wouldn’t see me approaching, and cat-footed my way after him.
I waited until he lifted his key fob, then pointed my finger at a new BMW, focused my will into the simplest spell a wizard can do, and murmured, “Hexus.”
Random magical energy lashed out, a power that would cause absolute havoc to modern electronics. But I hadn’t counted on my resentment for the jerk adding a little more oomph to the spell. Not only did it scramble the fob, but the wave of power washed over his new car too, and it started up with a roar, the high beams and emergency lights came on, the trunk flew open, the windows all rolled down, and the car alarm started wailing.
Tripp blinked at the fob and then at the car, and tried pushing the button again, right about the same time the hex ran its course, and sparks started flying from the fob and the car alike, before everything went dead.
“Goddamned Japanese junk!” Tripp snarled.
Which… said so much about him.
I caught him by the back of his sports jacket and half-threw him onto the hood of his car, letting the veil fade out as I did, so that as he whirled with a cry, I emerged from a blur of shadowy color, looming over him.


The Law: A Dresden Files Novella Chapter 5, Page 25-26