Abras is also starting to get pretty worried. Some combination of the panicking, the uncontrolled magic, and the head injury has left him unable to do anything more complicated than a personal shield, but he clearly still has the Gifts, just worse control of them than ever. That might not make him a disaster waiting to happen but he definitely can't rule it out. So he needs to do something to get himself unstuck.
He's lying awake in bed one night, too worried to sleep, alternating between contemplating the problem and contemplating the absence of Tylendel, when he comes up with an idea. The last time he did magic was when he was extremely scared, and he did lots of it, more than he ever had before. Maybe if he puts himself in a frightening situation again, one where he doesn't have time to dither and has to react immediately, that will be the push he needs to do something. It's a long shot, but being slow and gentle and cautious is clearly not working.
If he's going to do this--and it seems like a better bet than lying in bed being a miserable failure, he thinks as he stands up--he needs to be well away from anyone else so nobody else can get hurt. Outside the Vale would be best, both for distance from other people and for distance from the Heartstone, which he cannot afford to mindlessly grab at again. He grabs the warmest clothes he can find without waking anyone up and sets out for the nearest edge.