There are a lot of reasons why Nightwing chose the window route. Partly it was element of surprise. Partly it was familiarity.
And partly it was because he knew that Batman would have left the window open in order to get out again quickly.
He just sees Soldier 76 blink out before hitting the glass and he waits a moment for the man using Batman's body to turn away from the window. Once he's done that, Nightwing makes the jump, using the Legion ring and his own momentum to crash hard into Batman, arms going around the other man's waist to get access to the utility belt.
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And partly it was because he knew that Batman would have left the window open in order to get out again quickly.
He just sees Soldier 76 blink out before hitting the glass and he waits a moment for the man using Batman's body to turn away from the window. Once he's done that, Nightwing makes the jump, using the Legion ring and his own momentum to crash hard into Batman, arms going around the other man's waist to get access to the utility belt.
He just needs to find the right pouch.