[KitJ]

Frequently with the vest-style bombs, in the explosion the head pops off and goes practically straight up. The lower body basically stays put, and the waist-to-neck part is vaporized in the explosion.

Its not uncommon to find a head in surprisingly good condition near the blast sight. Likewise the legs. The explosion is directed outward from the torso.

Pro-tip: always look up when investigating an indoor suicide bomb site. The head of the bomber might be in the ceiling or stuck in the rafters.

Yech.

[MUDDOG]

head in surprisingly good condition

Could've used it back in the old days when they stuck it on a pike at the city gates.

[silverleaf]

Reports did say all that was left if him was his legs so your description fits
These pictures whould be sent to every mosque to share with wannabe martyrs

[PROCON]

Pro-tip: always look up when investigating an indoor suicide bomb site. The head of the bomber might be in the ceiling or stuck in the rafters.

Thanks for the heads-up.