Bring back Lifeline Shield

I don't mind the idea of her shield coming back and based on the knockdown shield that the revived person currently has but I think it needs a cooldown.  She shouldn't be able to revive both team mates in 2 seconds as she currently can.  It is pretty frustrating to be fighting a team with a lifeline and you don't get straight in there to finish them off but I guess we should know that when we fight them. The most frustrating thing for me currently is that there might be a fight, and I am down and have a knockdown shield and can, to some degree, look after myself until she decides to res me with no cover and use me as bait and then I am totally dead.  That seems to happen a lot.