Lightest weight called goes first...example.
Mick opens with 100kg on the bench. Next lowest bench is 110kg, Mick wants 105kg for his 2nd, he goes before 110kg and so on. The bar weight keeps rising, but we begin with the lowest weight.
Everybody has exactly the same oppurtunity, 3 lifts each.
What you cant do is, make 100kg opener, watch the bar weight climb to 180kg, then call for your second attempt at 110kg, that ship has sailed.
Once a lifter makes their first or second attempt, they notify the score bench as to their next attempt. If its the next lowest weight on their list, you follow yourself after 3 minutes.
If you call 110kg after opening on 100kg, and Big Nick has asked for 105kg, if he calls for 107.5kg on his second, he follows himself. He'll probably make it, then he calls for 112.5kg for his third, you play tactics and call for 115kg, forcing him to follow himself again, and he fails*.
You can then not call lower than 115kg, the bar must go up.
* He probably could normally make that lift, but Big Nick cracks under pressure
Hope that helps