Team Tactics Timing and Character Activation

[KavNX]

Can team tactics cards be played before you activate a character during your turn such as Avengers Assemble? Most of the Team Tactics cards tell you when they can be played specifically, such as 'when targeted by an attack' or other phrases but Avengers Assemble has no such requirements. My opponent claimed no window exists and that all team tactics cards must be played during and activation.

I found this thread which appears to say yes, but I want to be sure that there isn't something I am overlooking.

 

[Negoldar]

Active Team Tactic cards that do not specify they must be played during a character’s activation can be played before a character is chosen to activate.  
 

Avengers Assemble, Patch Up, and Field Dressing fall into this category.

Medpack on the other hand explicitly requires the activating character to play it. 

[KavNX]

Dang, your super fast. =O
My thanks.