One day while training, Chelsea asked Danny, "Are there any weaknesses that I should know about? For ghosts?"
"What brought that up?" Danny wondered.
"Just thinking. Everyone has a weakness, right?"
"Well, you're right. Ghosts have weaknesses, too." Danny ticked them off with his fingers. "The biggest one is blood blossoms, but they're extinct. There was Freakshow's magic ball thingy, but that was destroyed. Other ghosts can hurt ghosts… Electricity sucks. My parents have developed anti-ghost tech." He cocked his head to the side. "That's all I can think of."
"So, not that many weaknesses, cool," Chelsea said, nodding. "How do you know about blood blossoms if they're extinct?"
"Let's just say time travel was involved," Danny said dismissively.
"And… Freakshow?"
"I don't remember much from that incident, and I'm glad I don't." He crossed his arms in irritation. "Enough talk, more practicing."
"Yes, sir!" Chelsea joked.