The Utmost Vile Vampire ⑤

When Jonathan notices the swapped masks, I can easily tell his departure time from Cairo if I look up airplane accidents.

He will call Joseph to Cairo for his spirit photography ability, which can confirm the perpetrator and accomplices.

Joseph himself has been working in Japan for a while now.

When his grandfather Jonathan asks for his aid quickly, Joseph will surely board the airplane.

And any plane Joseph boards will always crash for sure!

In other words "Flight from Japan to Egypt has crashed"

equals

"Jonathan noticed the swapped masks"