I don't know if this would work in this particular situation, but one thing you can do to split a log is to cut a long wedge from the side of the log, sharpen it and then barely baton a slot with your knife, then use the wooden wedge and baton on it to finish splitting the log.
WARNING & DISCLAIMER:
SELECT AND USE OUTDOORS AND SURVIVAL EQUIPMENT, SUPPLIES AND TECHNIQUES AT YOUR OWN RISK. Information posted
on this forum is not reviewed for accuracy and may not be reliable, use at your own risk. Please
review the full WARNING & DISCLAIMER about information on this
site.