Avi K:
I can’t really stomach such a svara. I’d have to see something like that in the poskim because as far as I’m concerned there are not so many things that I’m allowed to interrupt my shemoneh esrei. If you had what was supposed to be a private meeting with l’havdil with Obama (just as a fun example) and were asking for something on behalf of your entire tzibur, and someone around you was making noise you wouldn’t “shh” them while having your important conversation. You might take a few seconds to regain composure, but you wouldn’t start loudly shhing everyone around you.
If it’s pikuach nefesh, I hear. If it’s a sefer that fell, and it bothers you, I hear. This? I don’t hear. I think the person who thought his cell was off/on silent, made a mistake, and did his effort to turn it off as soon as possible is a tzadik in comparison to the guy who said “SHHH” in the middle of shemoneh esrei. What heter is there? No svaras from the belly please – this needs to be written in the poskim.