Two more gunshots, and two small sounds of the bullets not finding their mark. It would not be impossible, but would take an incredibly accurate shot, he thinks.

Tonbokiri's eyes slip over to Sakamoto-dono for an instant when the second soldier breaks away from him and heads towards the man, followed by one more soldier. That will not be a problem for him, no matter which sword he uses.

Tonbokiri then puts his full focus on the three enemies before him, swift parries turning into powerful slashes to turn the solders into piles of snow. It is rather intense, taking limb and head, but thankfully they are not flesh and blood.

A fact that he is doubly thankful for when he turns his attention back to Sakamoto-dono.
Tonbokiri knows that it is important to Mutsunokami that he's never drawn blood. If these soldiers had been human, he would not have suggested what he did of Sakamoto.
But they are but snow, and now that world's Mutsunokami blade got to have an experience he would have otherwise never had.

Ah- well. Perhaps he's thinking too hard. It is not like they can be certain that there is another Aruji and another Honmaru in Sakamoto's world.

But still.

One pile of snow is already at Sakamoto's feet, so Tonbokiri stays back, watching. And also listening for more soldiers. Vigilance must be maintained.