So you're trying to compare it to Lee eh?
Okay so his Q is the best comparison.
1. It doesn't require vision.
2. It has a longer angel.
Diana has two have 2 skills ready to do what his Q does, and it has shorter range.
Lee Sin has 4 escapes. However they all have conditions.
1.) His Q requires that an enemy exists and you can dash there.
2.) His W requires that a nearby friendly target exists.
3.) Requires that opponent is nearby to slow so you can run away.
4.) Requires enemy to be nearby to force them away.
My point is that an escape is any move that will impede enemy movements and as a result enhancing your escape or enhancing your movement/travel capability to run away from your enemy.
Nearly all escapes will require a condition. Of course there exists some that have none, Leblanc is one example. Going by the way you guys are classifying escape, there only exists a handful. There will nearly always be a condition.
So you're trying to compare it to Lee eh?
Okay so his Q is the best comparison.
1. It doesn't require vision.
2. It has a longer range.
Diana has two have 2 skills ready to do what his Q does, and it has shorter range. Even then his Q is situational, that I wouldn't label as one. His W I'd say is an escape.
So her escape is to run away. Brilliant.
What about Lee Sin. What do you do? If all your teammates are in the Dragon's nest it's the same situation. You have to run away.