The explosive goes off before anyone gets out of the car. Maybe it was terrorist that rode the short bus,

But the angle that the cabby saved anything is ridiculous, it explodes before he stops or gets out, cabby didn't even know what was happening and just got lucky. At most he forgot to unlock the car getting out and sentences whoever was in the back to death by fire.

The explosive goes off before anyone gets out of the car. Maybe it was terrorist that rode the short bus,

But the angle that the cabby saved anything is ridiculous, it explodes before he stops or gets out, cabby didn't even know what was happening and just got lucky