?Side Player == West:titletext[format["Awesome Warrior\n%1\n has capped\n %2!",name _flagowner,_flagname],"PLAIN DOWN"]
The above line not only shows you how to display to only one side, it
also shows you how to name an individual that triggered the script
For your respawn warning
use the following in a trigger
Titletext [format["%1 \n You are entering an EAST Safezone \n Turn around or die!",name(thisList select 0)],"Plain down"]
if in a script use the following
?Side Player == West:Titletext [format["%1 \n You are entering an EAST Safezone \n Turn around or die!",name(thisList select 0)],"Plain down"]
The above line may also work in the trigger but i havent tested it