The globular torch-thing out front of the tech lab seems to have been lit between the time Cam left and his drone arrived. Robbie kneels down behind it, fiddles with something, then the circular pad in front of his door flares to life blue. He messes with the Sheikah Slate a bit until it produces a boop.

He looks at the drone. "Do I need to take this with me?"

"I just wanted to see what was going on, you can leave it behind." It lands placidly.

From the drone's perspective, Robbie taps something on his Sheikah Slate, and he vanishes instantly in a bright flash of light. Seconds later, they'll hear Robbie running down the slope from the Hateno Ancient Tech Lab travel gate.

He skids in through the door, striking a pose.

"Alright, where's Purah? Base of operations this time is going to be at my place, and for a VERY GOOD REASON!"

"I'm here! Long time no see!"

"Is this a joke?"

He looks at Cam, befuddled.

"Is... what a joke."

"I think he's asking why I appear to be a preteen girl!"

"Oh, is that not normal for you? I have no idea how your species normally ages or how your dimorphism works or anything."

"Purah is ONE HUNDRED AND TWENTY-FOUR YEARS OLD!"

"You can't just go around telling people my age, you know!

"So remember that time in Zora's we theorized that the desynchronous time dilation effect of the Sheikah Slate travel function could be wound backwards with a rotation in sixth- and eighth-space, and you said that's not possible because of interstitial locking? And remember the paper I wrote you four years ago about interstitial slip using pseudo-catalytic fields? And remember Leto's old work on mind-invariant transformations in space-time?"

"Unbelievable. It has to be you! The implications—if we can do this for everyone—"

"Yep!"

"...I still need to work out a few kinks. It wasn't supposed to turn me back this much. It's not really ready yet, but I had this terrible pneumonia that wasn't going away, and dear Symin called for a Zora healer, but it was getting worse, and. Well."

"Why didn't you tell me?"

"Well, at first I didn't want to publish until I had something working, and then those last few days all happened very suddenly, so there wasn't time... and for after..."

"I wanted to see the look on your face!"

"Let's get to business. We're relocating to Akkala."

"You know that Cam can just make another copy of your power tower here, right? There's no need to get into this again."

"Correct and incorrect! The tower isn't the reason! But first, let me show you what I have—and confirm my hypothesis."

Robbie stakes out half a table by sweeping all the bits and bobs to the other side, and lays out the roll of paper he brought from the tower in Akkala.

"Give me some pins," he addresses Cam.

"Don't damage the tables, old man! Just make some paperweights or something."

Cam places cute little glass paperweights with flowers in them.

Robbie uses them to stack down the paper and unrolls it to its full length. It's about two meters in total, and appears to show a graph. Three graphs on the same paper, in fact, charted along a continuous square grid. The axes are unlabeled. Robbie points at the red line.

"The tower is a beefed up ancient furnace, essentially, but what's interesting is the data. This is the power output charted over time, dating back two months, right up to the launch of Divine Beast Vah Medoh. Now, watch this!"

He traces the line back.