Double Bow is the yellow Turbo Attack for the Archer and Tigress character classes. The character pulls out two large crossbows and fires them in a half-circle towards the direction she is facing. It is practically a cut-down form of the BFG whereas no middle projectile is fired.
An interesting note about this Turbo Attack is that it is compatible with powerups such as Reflective Shot, Multi-Way Shot, and Elemental Amulets.
In the PlayStation version, this attack is bugged. Every arrow that the Double Bow fires does an incredibly large amount of damage. Near the end of the animation, several shots can be fired directly forward. This bug made the Double Bow far superior to the BFG, especially during boss battles. This was fixed in the DreamCast and N64