On second thoughts I think Cole may be taking the taxi to look for Alison and Scotty may be trying to stop him as the taxi is their only source of income. Maybe they only have the one taxi-cab? The room where they kept the drugs was the taxi-cab station back room so Cole would be hanging out there anyway as they are still in the taxi business.

Scotty says other people's lives are at stake here besides your own which could mean any number of things - which is exactly what they want to tease us with.