So a union rep looks unhappy - not a great sign possibly, if related to pensions - however it has to go to ballot. I don't care how unhappy or happy a union rep looks, I will vote to walk out the door if the company tries to sell my pension down the river.
Hopefully others will feel the same.
The union can and may advise its members to accept something, but it cannot make them. They are Reps - i.e. they represent us. They do not unilaterally decide for us.