Two checks happen in quick succession: Whether you have the cash to do it at all (red flash #1 if not), and whether you decide to go into the tower or not if you do (red flash #2 after you select yes). At least this seems to be my experience.
The first one makes sense.But I had the money.
The second one DOESN'T make sense... it flashes red no matter what I chose.
I think it's a bug!
