Question Trigger Homwork - Can you guess what this does

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tstat 38221
Name: 'seeall',  VNum: [38221], RNum: [ 3344]
Trigger Intended Assignment: Objects
Trigger Type: Command , Numeric Arg: 1, Arg list: seeall
Commands:
set room_var %actor.room%
set target_ch %room_var.people%
%echoaround% %actor% %actor.name%'s eyes glow yellow briefly.
%send% %actor% Your eyes glow yellow briefly.
while %target_ch%
  %send% %actor% %target_ch.name% is in this room.
  set target_ch %target_ch.next_in_room%
done

It creates a damage shield around the user. ON hit does damage to the attacker.

hmm.. are you sure about that?

By the looks of it, when you type "see all" you get send a list of who is in the room in the form of "Bob is in this room. John is in this room." Etc. It also sends a message to everyone else that your character's eyes glow yellow, letting everyone know you just used this trigger.

I copied the wrong trigger.

Your response is correct but one key detail. It sees Invis Immortals