Yes your absolutely correct, It would be better/more accurate if they update it and change it to...

"The Engineer is a master of Life and death and defeat their foes by Draining them Dry"

lol :-)

If not, then the final skill should be either an awesome debuff that targets all enimies and makes there attack accuracy 50% less
Or a skill that allows you to take control of a foe for a short while and you can use them to attack more enemies or blow em up by combustion.