Renegade Garou add. strike mandatory?

[Joscha]

I can imagine that you all wonder why I ask that question. But in the
finals of a recent tournament this was an issue. So we'd like to know:

Is the additional strike of a Renegade Garou a may or a must?

Card text read like a must, but I want to be sure.

Renegade Garou, Ally, 5 pool, Gangrel.
Werewolf with 3 life. 2 strength, 0 bleed. Renegade Garou gets one
additional strike each round and one optional maneuver each combat. He
may enter combat with any minion controlled by another Methuselah as a
+1 stealth (D) action. If Renegade Garou has less than 3 life during
your untap phase, he gains 1 life from the blood bank.

Thank you.

[Vincent]

> Is the additional strike of a Renegade Garou a may or a must?
>

A "must", like Lorrie.