"Ooh, my head..." TG groaned as she sat up. That last explosion was pretty powerful.
"TG! TG, are you alright?" Asked Mabel, recovering from the impact, as well. "Yeah, I'm okay."
TG's human form was not nearly as strong as her standard triangulum form. Sure, she could still use her swords, but she didn't have many powers, unless she shifted back into her original form. But that was definitely not an option, as that would blow her and Mabel's cover. Bill, Dipper, and Third were on the other side of the fortress, trying to set charges to get past the main security gates. Meanwhile, she and Mabel were trying to use explosives to dig a hole into the stockrooms.
"Yo, TG!" Came a semi-electronic voice. TG looked over at her video communicator wristwatch.
"Bill! What's the status on those charges? It's taking longer than I expected..."
"TG, there's no time. We've had a mole in our system this entire war. Reporting our every move to Kaos-"
"WHAT? Bill! Are you for real? Is there seriously a mole?"
"I can't believe I trusted him. He was with us this whole ti- *KSSSSSSH*"
"What? Bill! I can't hear you!"
"TG, Dipper's already been captured. I'm so sorry. You can't get us back. You can't dig the hole and make it to *KSSSSSH* in time."
"Bill, I think they're jamming our... Bill?"
TG looked at the watch as she saw Bill tossing the watch onto the ground. "I'm sorry, TG. I can't let them get you."
Horrified, TG watches a Triangulum grab Bill, just before he stomps on the watch. Then, all she could see on her watch was static.
Bill and Dipper had been captured.
And TG knew who the mole was.