Firing without a pause for 7.5 seconds / 4 seconds creates a small brown cloud that damages enemies who walk through it.
The damage is equal to Isaac's base tear damage, dealt roughly 5 times per second.
The clouds last for 15 seconds, meaning a maximum of two can be active at any given time.
The damage starts equal to Isaac's tear damage, dealt roughly 5 times per second. The damage will gradually decrease, while the cloud gradually increases in area size.
Each cloud lasts for 10 seconds; the damage decreases to around 43% for the duration of the cloud.
The clouds can be moved by shooting them.
Changing firing direction is allowed, but any pause in holding a fire button or taking damage resets the timer.
Notes
The visual size of the cloud is not accurate, as the actual hitbox is much bigger than how it appears.
Synergies
Gigante Bean: The clouds will be larger, increasing the range drastically. The damage is unaffected.
7.5 seconds / 
4 seconds creates a small brown cloud that damages enemies who walk through it.
Gigante Bean: The clouds will be larger, increasing the range drastically. The damage is unaffected.
Beans 
The Binding of Isaac: Rebirth
