Is this a bug ?

[NeoHippo]

In this map I have:
1 - Imp
1 - Demon (TID10) with Flag Deaf
1 - Demon (TID20) with flag Dormant

1 - linedef set to special 173:NoiseAlert (target_tid, emitter_tid) to alert the deaf Demon (TID10)
1 - linedef set to special 130:Thing_Activate (tid) to activate the dormant Demon (TID20)

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1. When I cross the 173 linedef (Alert Monster), the deaf Demon (TID10) and the Imp are alerted.
The dormant Demon (TID20) remains dormant regardless of gunfire or line of sight.
Then, when I cross the 130 linedef (Thing Activate) the dormant Demon (TID20) becomes active.
So far so good.

2. However, when I cross the 130 linedef (Thing Activate) first, then the deaf Demon (TID10) becomes active
and the Imp and the dormant Demon (TID20) will become active upon gunfire or line of sight.
Most peculiar and not at all expected.

And the example pwad:
http://www.mediafire.com/download/9dkel ... /alert.wad

[Graf Zahl]

No bug here. The 'activate' line is partially in the field of vision of the dormant demon. It depends on the point where you cross the line what happens.

[NeoHippo]

So, it is just different from what I expected to see.

Thank you for the quick answers.