Wasn't sure about the first one, we need a repetition.
The second one required 5 shots to end.
The third one also required 5 shots, but dealt more damage then the second.
oops, you posted so fast I didn't see it
first one was no energy upgrades
second was both energy upgrades
third was small energy upgrade
I was under the impression that the slow dings of health depletion received energy upgrade ... seems worthless to have any energy upgrades with the darkstar ... I've been basically running with ineffective upgrades ... this should be changed on the wiki