Boca de calça, while known today, is usually done wrong (or not done at all). Proper Boca de calça is a hard and high throw.
(Boca de calça in Raul Pederneiras: O nosso jogo, 1926)
It must be done using Snake+LightLegs mechanics; without the LightLegs it is not a proper Boca de calça.
Equip LightLegs; squat down (one leg forward) to seize opponent's ankles (or mouths of his pants, see below) and then quickly get back up and backward, throwing both arms upward. This is a high-energy point("Ho!").
Done properly, this lifts opponent's legs high above his head and makes him take a hard fall on the back of his head.
To top it off, when you use LightLegs, lifting his legs above the knee height applies a nerve disruption to him; so afterwards the opponent cannot do much but fall on his back or head.
The only defence against this fall is 'Balao de boca de calça':
The moment the opponent starts lifting your legs, before the nerve disruption takes place, equip LightLegs and shout "Ha!" ; twisting rightward in the air and reaching down with your right arm; then shout "Hii!", land on both hands and turn your legs over; tearing then out of opponent's grasp and landing safely.
Note: This technique needs Smilodon archetype; ie it is Smilodon+LightLegs; making it mechanically quite advanced.(See also Banda de lado).
Balao escape, excursus
However, there is a story to this defence! It explains why you are supposed to grab opponent's pants, not his ankles.
Originally, the throw was done by grabbing opponent's ankles from the rear (as on the picture above); this opened interesting counter opportunities you could use in the game of capoeiragem:
The opponent grabs your ankles in the throw, the above balao escape will create a nerve disruption in him; while scissoring him between your legs and taking him down on his front.
He can either fall, and thus lose the game (when done inside a game of capoeiragem); or, he can quickly let go of your legs, stand on his hands and do a quasi-cartwheel to the side; escaping. (The escape also uses Smilodon archetype).
This exchange is described in Joao de Rio:A alma encantadora da ruas (1908).
If you instead seize opponent's pants, the above counter will not work; this is why later, seizing the mouths of his pants ('boca de calça') was preferred.
If you already have LightLegs equiped when the opponent tries to do Boca de calça, it will nerve disrupt him; so the throw will not work.
Tactically, Boca de calça is a banda, so you should set it up using a jab. Thus you can also break opponent's LightLegs (see above).
'Balao de boca de calça' is one of the forbidden techniques in Pastinha's list.
The common Arrastao/Baiana, as taught by Regional - legs grab with shoulder pushing opponent'ships - can be easily disrupted using Clube X or Figure 4; therefore it was not used in old Capoeiragem; instead, this throw was used.
On a high level, Boca de calça is set up with chaotic nerve disruptor (do a few chaotic movements with the arms, then stand on one leg and lift your hand up, called 'figuracao' on the drawing); then, after nailing the opponent on the spot, squat down with Bear+Seduction1 to make him lean backward so you can throw him easily (quasi-negaca); this version also applies nerve strangle as you throw him.
This way to execute Boca de calça is the most powerful one and is seen in the picture sequence above.
If you read this, you are one of the few people who are not lazy and read my articles whole; therefore, I feel that you deserve this quite advanced bit of knowledge. For further explanation of the above, read my high-level texts about Capoeiragem.
I use the Bahian name for this throw; but in Rio, it was probably called 'Baiana'. It makes some sense; as it is entered using chaotic nerve disruptor which, as far as I know, was not used in Carioca, but was very popular in Bahian capoeira.
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