We should not underestimate how strong Datu is. He might have been wounded, but I bet he could kill a biter with a wrench or whatever is handy. He even killed a biter 2.0 in Denver. He cut it so deeply, it bled out. These are the same ones that shake off small arms fire at close range and ripped open the tanks with their bare hands.
There's a bit near the end when Datu is getting attacked, he cries out and there is a distinct sound like spewing blood. If it were Datu's, he would have died almost instantaneously - perhaps he did slice up another one.
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