Danny was worried. It was 2 days before his 18th birthday and he hadn't met his soulmate. Anyone who hadn't met their soulmate died on their 18th birthday. What would happen to him? He's already half dead, would he be fully dead? Would he stop existing? Did the soulmate thing even work for ghosts? Or halfas? Would nothing happen? Dan was technically 25 when they "met" and he's met adult ghosts before.
The more he thought about it the more anxious he became. It got to the point that his friends told him to spend a few days traveling. And now here they were 2 days before his birthday in Jump City.
He'd been a few seconds from stepping into traffic while stuck in his thoughts when a white and red blur ran into him. Or rather, through him. The shock of a soul-bond snapping into place kept him from accidentally walking into the road.
Ok, replying to my own prompt post because I wanted to add something funny to this:
Bart saw Danny begin to walk right in front of oncoming traffic and attempts to whisk Danny to safety, but Danny unconsciously made himself intangible while worrying about his 18th birthday. Bart runs right through him and trips because of the shock of "I went right through this guy like he was air" and the soul-bond.
Danny's introduction of Bart is Bart falling flat on his face after attempting to save Danny.