By design, a ghost can only cast one continuous (no cooldown) power at the same time. However, due to a coding flaw you can have a ghost casting multiple continuous powers concurrently.

Every ghost has its own counter of current active continuous powers. This counter is signed meaning it can be negative. A ghost can cast a continuous power if the counter is less than 1. The counter simply gets incremented and decremented by 1 each time a power is activated and deactivated. Here's where the bug comes in. If you cancel a specific continuous power while the ghost is beginning to cast that power, the counter will get decremented by 2 instead of 1. This means that you can spam cancel the power to get the counter way below 0 and later have the ghost casting multiple continuous powers.

11 out of 18 continuous powers can be exploited to reduce the counter's value. Here's a list of them that it works on:

All temperature powers:

• Bitter Cold
• Ice Breath
• Frostbite
• Sweat
• Roast
• Inferno

All continuous wind powers:

• Gusts
• Tempest
• Typhoon

And also:

• Hidden Maze
• Rain

You should spam cancel the amount of times based on how many continuous powers a ghost has. Once the counter is negative enough the ghost will be able to cast all continuous powers at the same time - even those that aren't on the list.