Edge sang a song in a language he didn't realize he knew as he waited for his poison to soak in. 

Eventually, the door flew off and the human smirked, whistling as he skipped inside and threw himself at the dragon. He embraced him. However, smiles soon turned to tears as Edge realized how much he had missed his mate, some of the bitterness fading away. Path really did have a positive effect on him. His tears stopped abruptly as he saw the blue blood, however. "....!" Edge was speechless, shocked, and ashamed. The poison he expelled, was, no doubt, dangerous for Path and their kids. Panicking, the boy suddenly let go and put both hands on his stomach. He then tilted his head up and took a deep intake of breath, effectively swallowing and dispelling the rest of the remaining mist. 

"Path.. I'm so sorry.... I just, I wanted to see you..." He mumbled stupidly. There was nothing he could do, other than cleanse the air. And he had already done that. Edge had lost his mind, but felt like he had found it once again. There was no time to explain how he could breathe poison.