Levi was being swarmed with magic monsters and was fighting them off hard before eventually he stumbled, as the monsters just kept coming and coming outside his own home.
The magic fighters (without Johnny) had appeared to help take down these magic monsters and were successful with more man power.
"You still want to be the magic vigilante of the town?, or do you still want to be solo?"
"Let me join the team please… I would have died without your help.."
After that Levi had joined the team officially and this moment happened as when another emotional moment had happened in a hospital room somewhere.