Yes, I heard that on Fox News. That is a miracle that no one else could be shot!
Fox web site is reporting that four others *were* shot, in addition to some being stabbed. If correct, I would think that rather than the gun jamming, the killer had emptied it. .45s often only carry 7 rounds + 1 in the chamber. The pastor was reported to have been shot 3 times. If the killer did not top off the magazine after jacking a round into the chamber, then he'd only have had 7 rounds total. And of course the smaller .45s might only have 6 round magazines.
Now it's still early and early reports are often somewhat confused. Still Fox also reports that 5 other people were taken to the hospital. If only one of those slashed could be treated at the scene, that accounts for the 4 others shot and two reported to have been slashed/stabbed.