Depending on the context, you could use:
* Scattering: This implies a group dispersing or moving away from each other.
* Disorder: This suggests a lack of organization or structure, the opposite of a procession's orderly movement.
* Isolation: This emphasizes individual movement, the opposite of a group moving together.
* Chaos: This implies complete lack of order, a stark contrast to a procession.
* Randomness: This suggests unpredictable and disorganized movement, the opposite of a procession's planned route.
* Solitude: This emphasizes individual movement, the opposite of moving as a group.
Consider these phrases to further express the opposite of a procession:
* Going their separate ways
* Moving independently
* Breaking up the group
* Falling apart
The best antonym will depend on the specific context of how you are using "procession."