Had a NICE Pronghorn buck I shot 2 years ago go this way too. Shot the in the left shoulder and sadly I was low 8 inches and broke his leg . He ran off on three legs about a mile to another group of hunters that dispatched him. Either I felt bad about the whole thing and stopped hunting for a couple hours and practiced about 40 rounds. I was dead on in the practice but i believe I got excited when i shot at this buck. Later that day I got another nice buck and that was a clean kill. Either way I learned a lot from that hunt and that is to concentrate on the vital zone. Either way in a deer hunt a month later I concentrates so hard on that shot and he went to deer heaven instantly. If the friend is cool he would share the meat with you and if he were a gentleman give your wife the kill.