"Of course, wouldn't want to waste too much of your precious time..."
Thankfully by know Ryuutaro had got to know where the first-aid-box was kept... finding out where it is was the first step upon arriving somewhere with Hayato as company...
And thankfully over the years Ryuutaro had also learned how to properly treat smaller wounds.

So only a moment later he has everything set and merely waits for Hayato to let him start.