Guild Wars 2

Was leveling last night and saw the strangest thing:

There were 4-5-6 rangers (hard to tell) all running together on top of each other with pets so it was a huge swarm, just zerging anything that moved in the zone. They were all following each other just inches apart and making the same mechanical movements in sync, attacking and destroying mobs in a second with their big pet swarm. They were using movement signets as well for added speed, and it looks like a botting speedrun type of deal.

I followed them for a minute or two because it was quite a sight, like a swarm of bees moving from mob to mob just cleaning house. It struck me as gold farming because they were all rangers and were moving as efficiently as possible, killing something, all characters loot, move on.

I am wondering if this is a type of known botting, where characters all follow eachother with pets and just wreak havoc.