Explosion, what do you do next?

[Scythe13]

Can I just put a thought into everyone's heads, secondary bombs are usually put towards exit points, so really you'd possibly be running into a secondary device's explosion zone.

Also, if it's a dirty bomb, or chemical bomb, you'll want to get it off your skin. That dust that's everywhere could be full of purposeful contaminants.

I am a fan of Steve's answer, and half of Mary's answer. But with the caveat that I'd try and wash off any of the dust, whether via a fountain, water machine, or anything like that. For an exit, I'd try and use a shop's fire exit. The alarms will already be going off.

Grab a tshirt off the shelf and use the inside as a dust mask. Wash off any crap from your clothing. If you're wearing a second top, e.g. tshirt under your jumper, cut off the outer layer (jumper) and do not lift it over your head. The last thing you want is more contaminants around your head. Then through the back of a shop and to the fire exit. If there is a secondary bomb, it'll be closer to the main exits, to cause more damage.

If it's not a dirty bomb, the best place would be back in the last explosion site. No chance another bomb will go off there. So you're better off in a 'tested' area. Only issue would be if it was a dirty or chemical bomb. Also, checking for structural damage would be paramount to survival.

Interesting that so many people would RUN towards an exit. What if you get there and there's another bomb or gunmen? Would your fitness allow you to run away? What about the risk of a human stampede to the same exit?

Stay calm, assess the situation, e.g. look out for bins in the area that could be holding secondary devices, check structural issues, etc. Do not do as everyone else does and run with the headless chickens.