Glad crew ok and speedy recovery, my first thoughts were, reminiscent of the early accidents with Robinson R22 , tail snapping off due to pulling back too hard on cyclic and chopping tailboom off. Then hang on, its a semi rigid head...what the hell could have cuased fire..
Anyhow this was a P3/T3 equipped with Helionix, there are cameras below fuselage and I think in tailboom (my pic playing with D-HECB 6 years ago at Le Bourget)
How old is this BCSO Fire Ec135? When was its last inspection / G check??
cheers