Possible responses to a lemming rush.
* Run in other direction as fast as possible.
* Join a curmudgeon-lemming sub community to discuss shortcomings of lemmings. (When possible, maximize infighting and break into smaller sub-groups
* Seek high ground. Ascertain likelihood of cliff in path of rush. If there is a cliff, try to warn lemmings. If there is not a cliff, stay in touch with friend-lemmings and observe or participate as you see fit.