I disagree here.
- Explosions are not as fast as you would assume. The speed everything usually uses is detonation velocity but that's not the correct speed to use for anything that propagates through the air.
To answer what I mean here's a calculator from
the UN. The detonation velocity for C4 is 8,550 m/s. Do you know what its velocity is after 1 meter?
1,323 m/s or nearly six and half times slower and that's for C4, let alone a basic gasoline induced explosion which is much slower (topping out at only 1,800 m/s for the speed
that it travels only through the material).
They shouldn't get anything close to hypersonic for that feat. It is some degree of supersonic since they outran the start, but we typically don't use running away from explosions as a feat since they almost always just rely on rule of cool.