Think the phone booth type scenario was his first choice (same stealthing as his shots). When he saw that go down, he switched to this.
Sac
Think very carefully.... Say the police agree to his demand and wire the money to the "account" he has set up.
Then, think about this, the perp walks into the bank for a withdrawal. Do you think, just maybe, someone might then be watching the "account"?
At least if this scenario actually happens, I hope the dupe who was hanging up on the guy when he called in isn't the one watching at the bank.