Would you want to in their shoes? They've been given 3 choices. Go for a very limited number of their own job, take on a new job with far worse conditions, or get sacked. It's a very very stark choice, especially as the company has already indicated that it won't be paying severance pay to strikers.
As far as work goes, most will be doing the bare minimum (and who can blame them). The difference with SWT is that for now, the guards there are secure and morale is reasonably high.
The pay is the same and they still get additional pay for Sundays the commission structure, break entitlement and rest between shifts is different. Surely these are things the union should be negotiating on.