"Yeah. Probably applies to drones trying to talk to my computer too. So I'll go through and if I don't come back and say something in... two hours... assume something's gone awry?"
Cam wraps himself in stun shield and guns the engine for the portal. He may or may not briefly turn off the communication devices so that he can produce a ridiculous war cry in the process without being overheard.
Well, the ship's unprotected, he was mostly using it for momentum. Does momentum work in this weird physics sphere? WHEEEEEE.
He replaces suit bits as necessary. Adds a layer of force shields. Adds a jetpack. Zoom.
Once he's close enough to get a good look at what they're shooting at him with he shreds it, interpolating it with air.
On the other side is... a very recently-abandoned industrial complex of some kind, situated in an open field under an unnervingly low sky. If he cares to look, it's reasonably obvious how the aliens were constructing their ships here to be passed through the portal in pieces and then assembled on the other side. The portal itself was extremely well-guarded until just now, but there are no aliens left.
Cam takes to the air, takes pictures, disintegrates industrial complex bits, and looks for where the aliens may have scurried off to.
Luckily, Cam can fly, and the lack of anything else whatsoever makes it really easy to spot the two other portals available. Presumably the aliens went through one of those.
Of course someone does! That's promising. Cam hauls the rest of the way through, takes a few pictures, disintegrates weapons.
Cam wonders if they're made of Real Physics or Actual Substances, but doesn't let this wondering distract him too much from indirectly blowing shit up. These aliens are really fond of their self-destruct mechanisms.
Cam is going to need to make a map. He starts a map. He goes back and sticks his head through the other fork out of Ex-Industrial-Park.