When attacker attack more, it becomes weak thats why they don't need deep pull back if the next target is weak target.
And when attacker collect more power and come back, it can easily engulf the barrier
And similarly
If attacker has already attacked so much, they don't need deep pullback
, if the target next castle is weak or it was already attacked in the past, attacker doesn't need deep pullback
But if the attacker has very strong target castle, they need deep pullback
And if the barrier is too strong and, they attacked that, now they need deep pullback to continue the journey
