Again if she tries to escape his death with smoke bomb if you chose deja vu, you can use setback in area and send her forward away from the smoke, and with less health ready to be killed.
As atlas it depends on the ability you choose, when she uses his smoke bomb (because is low at health) if you choose unestable fissure you can leave a bomb that deals 900dmg in area so you kill her.
When playing Vivian note that you can cancel your shield, I see lower level players keep it up when they aren't using it which means they have to wait longer to be able to use it again.
Skye is a big counter so hear are some 3 tips to counter her 1: try to stay close to your team and try to flare your back 2 : headshot her and pistol her down but is hard 3: make a deck with ROOST on lv 5 so is hard to kill you when you are scoping
When terminus uses his ult to get back alive, use reversal. If you time this ability right, you can fire over 3000 damage towards terminus and let your teammates or yourself finish him off.