Crankcase got hit with Crowbar's spear,which you said doesn't explode. Yet you still say that's why Crankcase blew up. Your logic is flawed
As I recal, Ironhide grabbed one of Crankcase's maces, shoved it in his face, kicked him into a building, bomb went off, kaboom. I'd rewatch the Mexican standoff if I was you.
Crowbar throws spear into Ironhide. Kills Crowbar. Uses Crowbar's spear and shoves it into Crankcase's face and kicks him into auto parts shop. Oil and gas cause CC to explode
Crowbar's spears were just long, black poles with red lights inside. What struck Crankcase was spiked. And Crankcase had spiked wepons.
I also liked Dino's Grapplings??? the highway scene he transforms and leaps into the air throws them things out there and hooks onto one of the dreads and jerks him around!