But I would rather be alone
Than pretend that I feel alright
Arcade Fire - Ready to start
Nobody was entirely sure when they had begun to notice.
Thinking back, it had started with the little things, occurrences so small that if they'd each happened as a solitary incident they most likely would have passed unnoticed.
There had been the time Reid had been hanging around Prentiss' desk in the BAU bull pen, to be quickly joined by Morgan and Garcia as they cast not so surreptitious glances towards their Unit Chief's office, waiting for the now departed JJ to emerge.
At first Prentiss hadn't realised the small white objects Reid was scarfing down as if they were about to go out of fashion were actually her antacids, purchased the previous week after the team had been called back to a case part way through a particularly spicy meal at a new local Mexican restaurant.
"Oh, AGAIN with the dairy?" she'd said, more than a hint of exasperation evident in her tone.
"I can't help it, I love dairy," he'd replied, popping another handful of the pills into his mouth as his eyes never left the office window above, silently cursing the blinds obscuring whatever scene was playing out in Hotch's office.
Within twenty minutes they were sat on the jet, the tension palpable during JJ's brief absence. Only Morgan had noticed the apparent discomfort of the youngest member of the team, the others first glancing towards the cramped bathroom to which JJ had retreated and then towards each other.
Morgan raised an eyebrow. "What's up kid?" he whispered, noticing Reid's expression quickly neutralise.
"Uh… I didn't, you know, go - before we left, I… kinda forgot." He smiled weakly.
Morgan watched Reid get to his feet and unsteadily make his way towards the rear of the plane, catching Prentiss' eye as they heard the knock on the bathroom door. Seconds later JJ reappeared, the team soon too engrossed in her revelation to notice a pale Reid wiping his mouth as he returned to the seating area.
The next time was more subtle. However, David Rossi noticed. As the Detroit police officer passed comment about those who visited the crime scene needing to have a strong stomach, the microexpression which had darted across Reid's face hadn't escaped the sharp eye of the BAU's veteran.
After Devil's Night had passed, Rossi's vigilance had continued.