Who cares where, loot his stuff!

Poor guy. All you did was kick him in his jewels and now he's out cold.
Looting him would seem cruel... But you do it anyways.
Upon the looting you find...
1 TOWER MAP
1 GATEWAY BLUEPRINT
1 SMALL GOLD WRENCH
2 LEVEL 1 MAGIC RELAYS
Sweet. You could probably transmute the wrench with the other one to make another Gold Ingot. The Blueprint and Map are also useful. Magic relays aren't really useful to you right now, however it is always good to be prepared. You never know when you might need them.
Then toss him back out the portal so he won't be a problem later.
> Toss him out of the portal and attempt to disable it from this side.
You then proceed to throw the guy back through the portal. He probably landed on all those rocks. That must of been really painful. The thought of it makes your body hurt.

Then you pull out the relays from the gate. You now have 4 LEVEL 1 MAGIC RELAYS.
> Examine the area more closely to try to determine where.
there's another gate
what if you're in a gate hub and you can go anywhere on greennook via those gates

It would appear that you are standing in a nexus of sorts for the gateways leading to the tower. There are 6 total, with 3 on the other side of the room.
In the center of the room stands a very accurate and highly detailed model of the entire island of Green Nook. Its actually quite impressive. They seem to have gotten right down to the locations of trees in town. Catrina's tent is even here! There are small lights are where the gates are. The one near the waterfall is blinking, probably indicating that something is wrong with it (Which is most likely why that guy came through it. He must of been a repair man). The other 2 are facing the south side of the island, while the other 3 are in the mountains or north of the mountains. This model is very, VERY accurate. Its almost uncanny. Its also very high tech. It might even have one of those fancy hologram projectors made by Gizmo Co.
To your left and right, there are two large doors.