Visual theming for a character's move

I am working on a top down game where the player must defeat different sorts of enemies. One of the possible classes on this game is the “Soldier”, which has the following moveset:

Primary Fire - Regular shooting
First skill - Grenade
Second Skill - Temporarily doubles fire rate
Ultimate - Air Strike

I want to have some sort of visual indication that the second skill’s timer is active. What could I do with the character visually to convey this information while falling into theme with it being a soldier?

This is some footage of the game. When the player starts glowing, it means they are using the move I described.

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