You know where the describtion says you give extra damage? Look: Basically you just shoot someone to death, BUT if your skills are activated (in this case extra damage) the script creates POINT_HURT.
With this "point" you can deal damage to someone, while you arent even doing it !
So I can do like so: F.F will deal 30 damage to n0life, without shooting: es wcs_dealdamage f.f n0life 30.

The reason why this is made, so that you get credits for you kills (the suicide logo).

The delay isnt easy fixable, point_hurt is just slow.
If you are dying, the point_hurt can be a "player" as well, so its also possible that it shows up in your console...

P.S. Never seen: Damage taken from "world" ?

You say he was an orc?

As in the race with respawn?

Ever thought maybe he came back to life.

Just a few things to note:
1. Your console has no concept of time, from that we can not tell if he killed you 5 seconds after he died or 2 minutes.
2. point_hurt is slow, but not very slow, it'd be a matter of less than a quarter of a second, unless your server is dying.
3. Respawn effects things.
4. From the description when you died, Len(lambda) still had 1 hp, which means he was still alive when he killed you, so it wasn't a delayed point_hurt