Focus: Having walls that are multi-layered, communication and reforming in front of the jammer.
Divide skaters into groups of 4 or 5, 1 jammer, 3/4 blockers. The jammer goes at 50% for this drill.
The aim is for the blockers who the jammer has passed to cycle to the front, trying to maintain two layers of blockers at all times. This is done by the front skaters continuing to hold the jammer back allowing their team mates to reposition themselves. This doesn't have to be done with a specific wall but that can help structure the drill, the focus should be having a multi-layered wall that continually repositions itself depending on the jammer - this is the dynamic element.
Encourage the blockers to communicate which of them the jammer is making most contact with, they can communicate via shouting things like 'on me, on me' or 'jammer here'. This should inform their team members that they should be getting to a position where they can add support to that blocker with the most contact.
Providing the skaters with examples of dynamic walls can be useful before starting the drill - anchoring: one behind or two behind, washing machine, diamond, fat controller and two in front & two behind.
Referees can join in with this drill as with dynamic walls in particular multilayer blocks can occur.