Ridge runner - apparently you haven't shot too many bear. They can move pretty good with 3 legs. I even watched my cousin bust a brown bear's shoulder with a 375 H&H and then the other shoulder when it turned to run and finally a 3rd shot to anchor it while it was plowing down the beach.
I only ever shot one blackie in the shoulder with a 300 WM and had to anchor him with another round. I don't care for the shoulder shot and found it better to slide the bullet behind the shoulder and into the vitals. They may run but they don't go too far - 50 yds at the most.
A shoulder shot will slow them down - but it won't stop them immediately.