Renard questioned Shogun's head chopping tactics.
There are a few possible explanations here-

1- The Tsung-Dao don't do many public executions. Most people convicted of a terrible crime kill themselves out of shame. The Tang-Dao were not allowed this more noble fate and were instead put to death by decapitation. The whole affair was a bit make shift (hence Shogun being allowed to do it rather than a formal executioner.) Because of this, the method used may not have been optimal.

2- Shogun may well have been offered an axe as a better weapon to chop onto a block with but declined because he wanted it to be HIS sword that killed the Heretic.
His sword is magic so would not be damaged. (This senario seems like a really Shogun thing to do!)

3- We don't see Shogun's head chopping method. He may push them forward more so he can slice right through the necks or he might lift up the heads to get a better chop etc.

Hope one, some or all of those helps justify what we see in the comic.
Personally I don't feel its a big issue anyway. The point of the scene is their reactions to death, the method of their deaths is far less important.

NO!

We must have accurate executions! Hark, you must redo the page to rectify these issues!

Righto.

Next page is cancelled.

Renard's orders.

Thanks, I was afraid that your comic might give the wrong ideas to impressionable youth; wouldn't you feel guilty if some kid got hurt when his cheap, stainless steel, made-in-Taiwan katana snapped against a chopping block and put his eye out while he was beheading some poor sod?

I know I would.

On second though, don't cancel next week's comic, I have visions of finding a chopping block in my kitchen one morning, and some angry foreigner in my pantry with a katana.

i bet no one is going to be able to look at shogun the same way, in the story, and maybe in the audience.

I dunno...I think the audience all looked at him as being a jerk before hand.

All this did was reinforce out collective opinion; as of this page we've seen him kill more wounded or captive people than fighting adversaries (not counting Nameless), and he's always a bastard to Muir.

Nameless should count!
In fact they should count double!
You need to kill them a lot!

But there's a proven difference between killing a masked, silent, and completely unreasonable opponent and killing an opponent when you can see his face and hear him speak.

He killed a fuck-ton of zombie things that were completely wrapped in armor and clothing, faceless and voiceless, that seemingly exist to kill shit. Okay, props.

But when it comes to people that aren't nameless; he killed the frost berserker (after he was weakened by Ki), lopped the heads off of two or three Junlocs in that same fight (and wounded two others), then proceeded to stab the two wounded men to death and they lay on the ground trying to hold their own guts in.

The next fight we see him in he gets shot before he can do any damage, and he later makes himself feel better by lopping the heads off of prisoners and wailing his katana off of a wooden block.

Yeah, this has just reinforced that we think Shogun is a dick.

Moreover, we now think he might be corruptible. So... yeah. Shogun. Useless asshole.