Immediately after saying those words, John immediately pulled the two bodies, removing them from the window. John wanted to lead the way and jump into the building through the window, before he was surprised when a figure flashed by.
This time, Jaden had taken the lead. Since he was the bodyguard, and they were entering an enemy territory, he obviously had to take charge. It would be completely unprofessional of him to allow John to enter first, considering that they did not know the dangers that might be waiting for them inside there.
Even though John was surprised, he still recovered, and followed behind Jaden. He understood that Jaden was doing this because he was a bodyguard. And as a bodyguard, he had to ensure the safety of his client.