This is for a grenade.
press G to fire.  grenade prefab has been added and has a particle
system (smoke). need to find a way to make this guy passthrough the
player and then enable collision
also shoot raycast when exploding after 10 seconds
should use collider.enabled for collider
Something like if collider col = player collision.enabled = false or
some shit.
OnTriggerEnter(Collider col){
if(col.gameObject.tag == "Player"){
collision.enabled = false}