function KaboomOnHit( target, dmginfo )
    if ( target:IsNPC() ) then
       local explo = ents.Create( "env_explosion" )
       explo:SetPos( target:GetPos() )
       explo:Spawn()
       explo:Fire( "Explode" )
       explo:SetKeyValue( "IMagnitude", 20 )
       target:Ignite()
       end
    end
    
hook.Add("EntityTakeDamage", "ExplodeOnHit", KaboomOnHit)