In the process of moving on, the entire strenuous and painful experience of getting over something traumatic, triggers are dangerous, especially if it was a direct one. For example, only recently did Night experience the death of someone he considered close. Seeing something that symbolizes Blade or his relationship with Blade could be considered a trigger of sorts.
However, what Night saw here crossed that line. It was no longer a trigger. It was cruel, it was one of the downsides of AI, emotions and consideration wasn't something that it could take in, or could it? Was it just his luck that caused such an event to occur? What stood in front of him wasn't something that could trigger the painful memory of losing Blade, it was Blade himself.
"Senior....Blade.....?" Night stuttered as he looked at the familiar figure in full Roman armor, other than the clothing, nearly everything about the man in front of Night felt and looked like Blade. "H-h..ow...?"