Someone to Witch Over Me - S7-E7
Visible crew/equipment: After Paige's guardian angel is snatched by Sarpedon, when Phoebe rushes out of the kitchen to find Paige lying on the floor, two long white tape marks are visible on the floor to Paige's left and right. (00:16:15)
Someone to Witch Over Me - S7-E7
Visible crew/equipment: When Kyle orders the helicopter to keep recording the survivor from the fire, Paige tells Phoebe that Kyle is really cool, then as Phoebe and Paige follow Kyle they pass the Celerity demon, and we can see the red T-mark at the demon's feet. (00:02:05)
Answer: That was a mistake in the series.
Also, the episode is called 'Babies First Demon' and this alone tells us that it's Wyatt's first time in the field (so to speak) and as the sisters say, they've done a good job of clearing up their own magical messes so far. Nobody really knows how advanced Wyatt's powers are, or will become. That's why the cleaners appear, to nip things in the bud. The Cleaners didn't want to chance that the sisters could clean Wyatt's magic up, just incase they couldn't. Therefore intervening themselves, just in case.