The engine that moved the propeller that provided the four-legged suit’s speed started spewing black smoke.

It was probably due to the explosion or the vibrations afterwards.

It was also possible it was a self-destruct function.

Either way, he couldn’t wait around for the suit to slow down now that it might blow up.

[...]

As Silver Cross Alpha headed into the depths of the tunnel’s darkness while wearing the powered suit with the armadillo-like armor, he heard an explosion.

[...]

A figure was standing in the blaze.

That figure was holding a small girl in his arms.

“Hamazura Shiage…!!”

[...]

(How? How did he survive? And that’s Fremea Seivelun. Unlike Hamazura, she didn’t have the benefit of any armor!!)

Toaru Majutsu no Index New Testament vol.1