I often find that trainers first move after a fall is to put headgear on.
I have saved some stats regarding laying such runners priced at 2.50 to 10.00 at Betfair SP. The sub 6/4 set seem to win too often!
Anyway, horses wearing headgear after a fall LTO are (since 1/1/08) 48/464 (10.34% SR) for a level stakes loss of 211pts (45.5% of stakes) at Betfair SP, giving the possibility of a modest laying system.
Hope this is useful,