Why can't Quinn's Skystrike include Vault with it?
Something like:
R - Skystrike
ACTIVE - TAG TEAM: Targetting an enemy unit will cause Valor to dash to the target (250 range). Once he reaches the target, Quinn returns to the battlefield to perform Skystrike, whilst simultaneously leaping off the target and landing near her maximum range. If no target is selected (edit: or is selfcasted), then Quinn and Valor will perform Skystrike without vaulting on an enemy.
Skystrike deals physical damage to all enemies within range and the damage is increased by 1% for every 1% of the target's missing health. If Skystrike has not been cast during Tag Team, it will be cast automatically when Tag Team ends.
Note: The vault portion doesn't deal extra damage.
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Not having separate cooldowns is fine, just give us this. Quinn doesn't have any defensive steroids that warrants her diving in without escape. I know you can vault-tag team cancel, but you generally don't have the luxury of waiting 8 seconds for vault to come off cooldown.