Core/Movement: Fixed knockback visibility for other players (no more "teleport") and knockback strength from creature spells (this does not fix knocking creatures back)

src/server/game/Entities/Object/Object.cpp

@@ -1488,7 +1488,7 @@ void Position::GetSinCos(const float x, const float y, float &vsin, float &vcos)
     float dx = GetPositionX() - x;
     float dy = GetPositionY() - y;
 
-    if (dx < 0.001f && dy < 0.001f)
+    if (fabs(dx) < 0.001f && fabs(dy) < 0.001f)
     {
         float angle = (float)rand_norm()*static_cast<float>(2*M_PI);
         vcos = cos(angle);

src/server/game/Entities/Unit/Unit.cpp

@@ -16510,7 +16510,7 @@ void Unit::KnockbackFrom(float x, float y, float speedXY, float speedZ)
 
         WorldPacket data(SMSG_MOVE_KNOCK_BACK, (8+4+4+4+4+4));
         data.append(GetPackGUID());
-        data << uint32(0);                                      // Sequence
+        data << uint32(0);                                      // counter
         data << float(vcos);                                    // x direction
         data << float(vsin);                                    // y direction
         data << float(speedXY);                                 // Horizontal speed