On Github, when you blame a file, you can see all the commits, annotated on the left hand side. They also have a very helpful link called "View blame prior to this change", which allows you to go to the blame of the same file prior to the commit you clicked on:
It allows you to very quickly traverse the git history of a file, and get to the root cause of a bug/problem.
Is there an equivalent feature in Bitbucket?