I tried swinging my body to fall, but whatever substance they used to tie us was quite strong.
Use your head for this, gather your spirit energy, and use it to melt these.
I closed my eyes and tried to gather the energy. At first, it was like water coming from a tap, but it was becoming bigger. The tap became a well, a lake, a river, and a vast sea. The gush was alone enough to melt it away. I gathered the energy towards my fingertips and released it. It worked like a laser. I fell pretty badly to the ground.
After managing to get up, I rushed towards the second team and carefully placed them on the ground. Then, I put my team on the ground. "It could be the work of some low-level wraiths, maybe someone of a higher level," I said.
You are right, this level of casting needs someone of a higher level.
I tried to wake them, but as Fulminor said, I couldn't.