Tactics | "Why not this move"

So,

I came across this puzzle today: lichess.org/training/61639 and it seems simple: White Queen is trapped, capture it.

The solution is to play 1... Rh5?! trading the queen for rook.

BUT WHY NOT 1... Bc8! accomplishing the same goal but keeping the rook?

Did i not see something?

YES, I DID NOT SAW SOMETHING.

1...Bc8?? 2. Ra8!+ Kb7 3. Qxb8#

Sorry for unnecessary post.