The ability cannot be set to auto-cast; it has to be manually activated.
The worm cannot perform other actions while channeling Burrow Attack, with the exception of [Kill Command] (which will prematurely end the channeling).
Tips and tactics[]
Using Burrow Attack will cause the pet to drop threat, so be mindful of this while engaged in solo content.
Patch changes[]
Patch 6.0.2 (2014-10-14):Cooldown reduced to 14 seconds (down from 20).
Patch 5.0.4 (2012-08-28):Cooldown reduced to 20 seconds (down from 30).
Patch 4.3.0 (2011-11-29): Burrow Attack now does approximately 20% more damage, and has an increased area of effect..