Ando had several opportunities this and last episode to help Hiro and others supercharge their abilities to take down building 26, Sylar. Why isn't he using it, rather than the "crimson arc" side effect? His abilities haven't been taken away that I have seen, so why didn't he help supercharge Hiro when he started getting nosebleeds?

Hiro is already having problems with his powers being rejected by his body and by supercharging him he could essentially kill Hiro.