After U-1146 shifts himself to the front of the white spiked bacteria, some of the spikes stab his arm, his blood staining his sleeve. But after two shots (when he says Die! You Germ!) and the shot when he slices the bacteria, his sleeve is completely clean and free of blood stains.
After U-1146 shiftily slices a couple Streptococcus, he holds their corpses and tries to get out of AE3803's sight. But when he does a backflip, he resembles U-2626 more than himself.