I expect we'll see a clarification to that in the next year. I reffed last year locally and am familiar with how this scenario was handled at regionals.

The upright skating skater is the pack is not obligated to sprint in any direction to rejoined the "downed" skaters, which is always true. She is also not the one that destructed the pack. She is obligated to attempt to rejoin the upright skating skaters immediately to avoid any out of play or failure to reform penalties.

The skaters that put a knee down are all subject to destruction of the pack penalties, likely minors which would be harder to acknowledge than majors. Usually you see this the other way around - 3 skaters skate forward past the pivot line, the one nearest the jam line puts a knee down after the whistle to time the release of the jammer, while the opposing team is on a knee at the jam line. Once "no pack" is called, the jammers are released. It's a way to avoid the rugby scrum, but not without a cost of gaining penalties.