Panic.
He's never felt this before. His heart is beating faster than ever and his breath is coming in short gasps. He tries to orient himself but the area around him is unfamiliar. Cliffs loom above him as he sits at the bottom of a canyon. The wasteland could be anywhere his halves have trained before. It's only when he tries to get up that he notices the pain. It's strong and burning. His left side feels like it's on fire. He looks down to see he's already covering a wound of some kind with his hand. He slowly raises it and bites back his nausea. Thick and dark red blood coats his fingers. He can't see past his gi but he can imagine how bad it looks. He leans back on the rockface, takes a deep breath, and tries to remember how he got here.
Right away he can tell one of his halves is a much weaker presence than the other. Injured. Faint. The other one has the memories of the fight they had just been in. One of them had been hurt, badly, and their teammate with the sensu beans was too far away to get to in time. So they fused. An attempt to keep the wounded half alive long enough to be healed. They would share the pain. Share the damage. Tiencha would have laughed if his side let him. His halves really cared about each other.
He tried to focus on that feeling instead of the pain. He noticed it had been a while since the last time he existed. It seemed his halves had gotten closer in the time between. Much closer. He cracked a smile and coughed out a chuckle.
"I love you..." he mumbled to himself. That was a sentiment from both of them. A feeling they shared. Tiencha took that love and focused on it. He closed his eyes and put pressure on his injury. He needed to make sure he didn't bleed out while he was waiting for help to arrive. His halves felt a little bitter about needing help, one much more so than the other, but they both knew they couldn't move on their own. Tiencha could vaguely sense a familiar Ki approaching him. He let himself relax a little as he started to black out. They'd be okay. All of them.