What makes you think bitcoin will go back on 400?
Because there is no confidence in this break-out to the upside, it looks like enticement into a trap. There is no big news that could justify such a sharp change of trajectory from down to up, which makes me think it's just manipulation, to lure and then shave price chasers. Besides, the price shouldn't start rising again much before June is here, if you look at previous bubbling up phases, it's still too early for that. In short, I don't believe in this rise just yet, it may still go up a bit, but stay alert, it can likely go down in the short-term.