Leg-hold triggered explosive combustion (or Beastrix) trap:
- An off-set high momentum steel jaw trap chained to ground (something like a common Bear trap should do)
- Timed, spring-loaded activation valve with an ignition system; depressed trigger opens the valve, allowing inert propellant gas (like nitrogen) to propel the liquid pressurized kerosine to pass over the electrically-heated wire coil and establish combustion. Limited amount of Oxidants should allow only for a short-timed exothermic redox.
- Hermetic seal material combined with square wire netting
Image explanation for less educated or imaginative: