it compares the health of the deathseeker that you are targeting to the other one and shows the diff.
green number = your team is ahead
red number = your team is behind
the adds need to be killed around the same time.
Requested by Anonymous via https://docs.google.com/forms/d/1AkKme3CIgoF7YrLBT5zljMbuyZX7kkPqRTv75dg88E0