Pick random instance from already picked instances

Hey everyone,

The title says it all , How could I pick a random instance of already picked instances after let's say ... a comparison

As if variable1 = 10

What I did is

Pick All Object1

If Variable1 = 10

-- Pick random instance

--- Do whatever

But it doesn't seem to work

Am I missing something ?

Should work, probably something else that is causing the problem.