Broodmother has 4 idle animations

1. idle, used when outside the web and not on low health
2. idle injured, used when outside the web at low health
3. web idle, used when inside the web and not at low health
4. web idle injured, used when inside the web at low health

As of now, the immortal item replaces the default idle animation with a custom one. This custom animation has the hind legs spread out, so they do not clip with the back. But it does not have custom injured and web idle animations.

This results in Broodmother using the animations as follows:

1. outside the web and not at low health: Immortal's custom idle animation
2. outside the web and at low health: Immortal's custom idle animation
3. inside the web and not at low health: Immortal's custom idle animation, or default web idle animation
4. inside the web and at low health: default web injured web injured idle animation