Forum:Hero Signal + Stratos

So it is a good idea to special summon Stratos after activating Hero signal to get another E-hero in your hands. This was the main reason why I added Hero signal, but if for example Sangan is destroyed by battle and Hero signal is chained, then why is only the search effect of Sangan activated and is Stratos' search effect declined after it's summoned to the field? I just got into this situation and read that the timing of Stratos was incorrect, but that still leaves me clueless. Anyone? ;)