John glances between the two of them as he leans back from the drawing and, after a hesitant second, frowns a little uncomfortably before focusing on Ianto. It's a little weird having such close, focused attention on himself explaining something from both of them. John's usually not the explainer, and he feels oddly like a fraud.

"Even dialling Pegasus required extra power," he adds, and mulls over the thought. A nine-chevron address, and something about a... code in a video game? The additional power requirement was probably huge, especially if they were using Icarus Base. Still -- the question to Ianto has John turning toward him -- closing his notebook and sliding it back to him with his pencil.

"That will now self-destruct in five seconds," he adds softly, and twitches a smile before leaning back with his tea to let Ianto take over.