I also remember floating in front of "Plaza de la Gloria's" (X) and seeing others get blue floaters with their hands.
We (husband and I could not understand why others did not flinch)
Later husband was covered in whip lines. It looked like I had whipped him all night as the Dominatrix. The gang had a good laugh that weekend.
Not so funny for husband. I think they where tails of antimonies.??? Even if they are not attached they are poisonous lines of fire. Vinegar, salad dressing was a Saviour,