The alley had seemed a likely enough place to start trying to track down some kind of portal or gate or just some shit that had brought him here from Dakota, but Dean wasn't getting any sign of anything.
At least, not until the guy erupted from the earth behind him and started cussing.
Dean slammed back, pressed against the wall, gun drawn before thought, aimed right at the stranger. "Who. The fuck. Are you? And where the hell did you come from?"