That's why we have something called cover and using the battlefield to your advantage, two things Keda is an absolute expert in and uses to his full advantage.If even a dozen people open fired on Keda while he has an adamantium stick, he’s still bite the dust, as the spread of bullets couldn’t be blocked so easily, let alone a hundred guards with guns
Let me put this simply, Shen.
KEDA IS NOT JUST A CAVEMAN.
Yes he's from prehistoric times, but he's a warrior beyond the calibur of several members of our cast. Like *cough* the Yu-Gi-Oh characters. It's because Keda has equal parts heart, mind and skill, as well as experience with the tools he needs.
He can kick the collective asses of a troop of John Does any Sunday. Will he take a hit or two? Maybe. But he'll still kick those collective asses.