my.emask |= (ENABLE_SCAN | WHATEVER...); // now c_scan + SCAN_ENTS detects / triggers me

ENTITY* myplayer;

#define health      skill100
#define can_explode skill99
#define do_explode  skill98
#define removeable  skill97

void rayps_exploscan (ENTITY* _ent){
   if (!_ent) return;            // entity doesnt exist? stop!
   if (me) my.removeable =    0; // when 1, explosion done, "FOR" cycled through all ents
   var _explorange       =  300; // range of explosion ( _ent.x + 300 )
   var _stored_you       =    0; // guess this is optional. avoids(?) that this code changes YOU
   if (you) _stored_you = handle (you);
   for (you = ent_next (NULL); you; you = ent_next (you)){
    //if (!_ent) break;                     // wtf!?! lost _ent - entity? stop!
      var _dist2ent = _explorange + 1;      // distance _ent.x -> you[n].x: starts false(>range)
      _dist2ent = vec_dist (_ent.x, you.x); // _dist2ent = distance between _ent and you[n]
      if (you.can_explode){                 // only damage some ents, with "can_explode = 1" 4ex
         trace_mode = IGNORE_ME | IGNORE_PASSABLE | USE_POLYGON;
         if (_dist2ent < _explorange) if (c_trace (_ent.x, your.x, trace_mode)){ // hit something?
            you.health      = 0;            // you.can_explode=1 + in range + hit by c_trace? DIE!
            you.can_explode = 0;            // only a "oneshot" event
            you.do_explode  = 1;            // when ent dies, it'll produce an explosion too
         }
      }
   }
   if (_stored_you)  you = ptr_for_handle (_stored_you); // restores you - pointer (optional?)
   if (me) my.removeable = 1; // me aka my, still exists? then mark as removeable now!
}

action WED_Barrel_Explo{        // very basic n simple example of an explodeable object
   my.do_explode  =   0;        // if set to 1, we'll explode when health <= 0
   my.can_explode =   1;        // now the "FOR" takes care about us ( = we're explodeable now )
   my.health      = 100;      
   while (my.health){           // iam alive...
      draw_text ("Barrel: Waiting 4 rayps_exploscan's in range (health>0)...", 10, 10, vector (0, 0, 255));
      wait (1);  
   }
   set (my, PASSABLE | INVISIBLE);          // switch in2 ghostmode :D
   if (my.do_explode) rayps_exploscan (me); // produce another explosion, this time at "my" pos
   while (!my.removeable) wait (1);         // while zero, my explosion (FOR) is still running
   wait (1);
   ptr_remove (me);                         // finally remove this exploded, damaged barrel
}

action myHero(){
   myplayer = me;
   ...
   while (my.health > 0){
      ...
      if (key_space && !myplayer.removeable) rayps_exploscan (myplayer); // debug: spawn explo's around player (waits until explo done)
      ...
      wait (1);
   }
   ...
}

c_scan (my.x, my.pan, vector (360, 0, 1000),...

c_trace (...tracestuff...);
if (HIT_TARGET) draw_point3d (target.x, vector (50, 50, 255), 100, 3);
// ---------------------------------------------------------------------------------
// mhm, not sure c_scan sets HIT_TARGET, thats why i would use "result" 2 compare instead
if (c_scan (...scanstuff...)) draw_point3d (target.x, vector (50, 50, 255), 100, 3);