Even as he healed Tobirama, Ren proffered part of his knowledge to Hashirama, directing him into better ways to use the chakra he had. The boy was not all that skilled, but he did have heart, and if somehow he could keep the clan head hanging onto that thin thread... just long enough while he took the Senju out of mortal danger, then it would be worth it.

Ren instructed salves to be made, thankfully the forest around them was abundant in ingredients. It was a whole tense hour before Tobirama was finally out of danger, and he thought their work had been in vain when he took over from Hashirama. Tajima had grown a few shades paler, and had stopped breathing... but then as if by some miracle, without Ren giving up, sweating even as he tried for hours to feed the man life again, it paid off. He resorted to consuming a chakra pill when he felt it was all he could do, not caring for the side effects. He would save them both. It was his duty.

Butsuma held Hashirama close to him, even as he wept onto his son, asking for his forgiveness.
Hashirama, after all. had told him about peace so many times... and all these times he had hit him.