I always thought about the vast amount of wasted energy in a surface bomb blast. So much energy goes upwards and into the atmosphere and is totally wasted. A bomb that goes off inside a tunnel system or other underground cavity seems so much more effective.
Personally, I'd set the bomb up so it didn't go off on impact - but I'd have it wired with audio or camera so one could watch the increasing crowd of IS terrorists and their supporters gathering around it, filming, and celebrating the "total failure of the Crusaders bomb".
When the crowd increased to a sizable number of terrorists,
then I'd set it off. Yes, I know, I'm an evil bastard!
It must be my military engineer experience.
