ill repeat what a predecesor said.
WOW your thick.
If you look closely, you can see the thought bubble clearly points to tobirama. Also there is literally NO REASON for tobirama to raise his chakra levels, to use whatever jutsu he was gonna use. Meanwhile hashi raising his chakra levels to threaten his brother makes perfect sense.
And just because you have a viz translation, doesnt mean it is perfect.....NO translations, are perfect, as languages have many different words and meanings. For instance, lets translate more literally.
We watch a tv show about a topping for ramen, where the topping for ramen whirlpool/vortex goes and learns a spiraling ball. He has a scarecrow teacher, a flower teammate.
Just because viz puts more time into it, doesnt mean they make a perfect translation. It doesnt mean that they cant be wrong either. At this stage if you cant see that, then you are more arrogant, and stubborn than the people, who after extennsive flashbacks, still thought obito was someone else, or being possesed by like izuna or something.
Just accept the truth. Hashi broke the room by starting to power up. Deal with it. It is possible tobirama can do it as well, but in the manga, it was HASHI.