Does anyone know how Kerry plays those riffs?

Fellow guitarists help me out. Is he 16th note strumming all of those blast beat riffs, is it triplets or is it half time in 8th notes. Ideally, it would be 16th notes that match the drums but, man that’s FAST is he just that good? My wrist gets tired 10 seconds in lol.

In live clips, his wrist looks slower, more like triplets or 8th notes but I can’t really tell. Does it depend on the part? Need answers