A gif of the thunderstrike used in the game, to exterminate opponents (humans with various hand-held weapons) by swiping from right to left.
It was based on a real thunder photo. I traced-roughly-recreated it in photoshop, separated in parts that animated in AfterEffects and exported the animation in 30 frames. Then I used these frames with a PackedSprite (anbsoft's SpriteManager2) that plays this animation when a thunderstrike is called. (click on the gif to see it in full res)