Hartman informed him that the sphere came through after the ghosts, through the breach. Intending to check out said breach, the Doctor walked quickly out of the room. As he by this point, needed the loo, and Hartman had promised to "make him perfectly comfortable", he took a left towards the toilets he assumed were near the cafeteria, instead of a right, going back to the part of Torchwood they came from originally. Yvonne noticed and barked after him. "No Doctor!". He ignored her naturally, confused shout and kept walking.
"Stop Doctor!" she yelled again, louder. He stopped and turned around.
"Oh. It's okay, I'm not running away, just taking a quick..detour," he explained discreetly.
"Where? There are no detours on the itinerary." Yvonne said firmly.
The Doctor frowned. Even if this particular moment was almost certainly not the pre-scheduled "toilet break" time, her words seemed to suggest no time were.
"Wait. Really? Not any?" the Doctor asked, confused.
"No," Hartman confirmed. At this point, the Doctor figured she didn't see that as a detour, as they probably planned for him to get his bathroom break in a more organized manner, so it wouldn't technically be a detour.
"Well, I'm just taking one of our breaks, now, if you don't mind," the Doctor explained, and requested politely.
"There are no breaks in the itinerary. That would be foolish. Breaks, in regards to prisoners, are decided upon at the moment they're needed," Yvonne explained.
"Oh, good. ´Cause I just need to pop round there for a minute, won't be long,' the Doctor stated.
"Now is hardly the time for a snack, Doctor" Yvonne chastised.
"Oh, no it's not that. It's what's next to it," he corrected.
"There's nothing next to it," Yvonne replied, not understanding.
The Doctor sighed and blushed in resignation. He had to spell it out.
"Well, according to my excellent sense of direction, I believe there's a toilet," the Doctor pointed out.
"I'll only be a minute, I can get to the offices the other way 'round just fine," he assured her, almost begging to be let go.
"Sorry, but Queen Vicky didn't trust you, so neither can we. Sebastian will escort you," Yvonne instructed, after which one of the soldiers, Sebastian, approached the Doctor. He nodded and walked on, begrudgingly accepting the supervision.
They reached the men's room.
"There's a window in there. Can I trust you won't make a run out of it?" Sebastian asked, clearly implying that he would seriously accompany the Doctor inside, if there was a risk.
"Absolutely. Cross my hearts," the Doctor promised firmly, making sure to evade all potential need for Sebastian to go in with him, which would be beyond humiliating.
"Be out in just a tick," he announced, walking into the loo.
He went over to the toilet and urinated, sighing in relief.
Back in the office, Jackie realized something. When she had hugged him and he had protested, one of the things he yelped was "I've got to go"! She sighed in sympathy, seeing how she was partially responsible, and made a mental note to listen to the Doctor more.