Help with rs.pointarraytransfrom(x, rs.xformmirror())

Hello
since my script surrounding rs.Pointarraytransform(x, rs.XformMirror()) does not work the way I would like it to, it would be amazing if you can point out the mistake I made. Ive tryed for days, but could not find a solution. Thanks!

The coordinates of a tetrahedon, need to be mirrored at every cornerpoint using those of its sides, that are meeting in the cornerpoint as mirrorplane defining normals.
For context, the tetrahedon fits into a rectangle of sidelength( 1,1,1 ), and the final aim is to write a script for conways game of life, in which the existance of an instance depends on its neighbours.

By comparing the coordinates I plan to identify neighboring tetrahedon-cells.

Using rs.InsertBlock(Tetrahedon, xformmirror()), a mirrored tetrahedon is inserted flawlessly.
But the way I use rs.pointarraytransform() , it does not seem to work. Where did I make a mistake?

Thank you very much and with best regards,
Aero

This is my code:

import rhinoscriptsyntax as rs

rs.DeleteObjects(rs.AllObjects())


##Block
coordinates = [ (0,0,0), (1,0,1), (1,1,0), (0,1,1)]

#draw the tetrahedon:
lines = []
for entry in coordinates:
    aktive_Postition = coordinates.index(entry)
    for counter in range(len(coordinates)):
        if counter > aktive_Postition:   #makes every combination of ccordinates. no dublicates with counter
            line = rs.VectorCreate(entry, coordinates[counter])
            if rs.VectorLength( line ) >= 2**0.5: lines.append([entry, coordinates[counter]])  #2**0.5 = sidelength of tetrahedon
 rs.AddBlock((rs.AddLine( pair[0], pair[1] ) for pair in lines), (0,0,0), name="cell")

for p in coordinates:
    print "--> {}: ".format(coordinates.index(p)), p
    for pair in lines:
        if p in pair:
            #here starts the problem:
            print "!!!{} contains point!!!".format(pair)
            mirror = rs.XformMirror( p, rs.VectorCreate(pair[1], pair[0] ))
            mc = mirrored_coordinates = list(rs.PointArrayTransform(coordinates, mirror))
            for (a,b) in zip( coordinates, mc): print( a, "mirrored {}".format(b))
            #print "mirrored", mc
            #V1: - no problems
            #rs.InsertBlock2("cell", mirror)
            #V2: - not working properly:
            #rs.InsertBlock("cell", rs.SortPoints( mc, order=4)[0])
            
            #"""V3 drawing the tetrahedon form mirrored_coorinates:
            for point in mc:
                aktive_Postition = mc.index(point)
                for counter in range(len(mc)):
                    if counter > aktive_Postition:
                        laen = rs.VectorLength( rs.VectorCreate(point, mc[counter] ))
                        if laen >= 2**0.5: 
                            rs.AddLine( point, mc[counter])
#"""

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