I am playing with
Metroplex, and I have
Backup Beam and
Debilitating Crystal attached to him. My opponent has
Menasor equipped with
Stunticon Swagger. It is my turn, and I play Height Advantage to get the extra bold 4 to try and activate Metroplex's triggered ability from card flipping. As I declare him as the attacker, and Menasor as the defender, Debilitating Crystal activates. I choose to bounce Swagger to my opponent's hand. Does my bold then become active because the effect of Swagger is no longer active? Am I allowed to use the bold from the upgrade and the action now?
[Source: WotC] 
Yes. Both bold effects would apply in this scenario.
Stunticon Swagger does not stop a character from getting bold prior to the attack.
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