Good to hear there was no serious injury. With that being said,

. Your buddy just did what a good number of others have done at some point in time.He's definately in good company. Though it may haveknock him on hisa$$, if it's a good quality muzzleloader, it probably didn't hurt anything. Check the barrel for any unusual bulges or signs of stress and look the stock over for any cracks and such. If nothings found, it should be fine to shoot.I'll bet he won't forget to pull the rodagain.