With your mouth...
go to school, learn sign language =p
No, tennis coaches cannot effectively coach from the stands during a match as they are not allowed to communicate with the player during play.
No, it is a cheap spring gun and could not be used in an airsoft match
Just talk to him/her. If they are really your perfect match they will understand what you are trying to say and you shouldn't be afraid to speak your mind around them.
No.
Not really. I mean it stops an airsoft shot, but it will not properly defend you during a terrorist attack, or nuclear fallout You can buy airsoft plate carriers, which could technically hold bullet proof plates in them, but they are not meant for this and should not be used in that way. But you can buy airsoft proof plates which will absorb pretty much the whole force of a bb's impact, effectively protecting you from airsoft guns if that is what you meant.
Airsoft GI
they communicate during ... through chemicval reactions
I frequent the only real airsoft fields in Virginia. The three most known places are Xzone, Splatbros., and Ballahack Airsoft. there was also a CQB arena called TRU, but it recently closed. Ballahack is one of the best fields I have ever been to. If you are looking to have a match by yourselves then you are best off trying to play somewhere in the woods.
evike, airsoft megastore, airsoft gi
airsplat, airsoft arms, airsoft megastore
You can play airsoft in any weather. Airsplat.com has Ghillie suits and vests to keep you warm in the cold so you can play airsoft at anytime of year. Check out Airsplat.com for airsoft accessories and guns.
All airsoft can jam. Phrase your question better. Such as Does blowback airsoft jam more than spring airsoft?