#1 - Snakes often use the least amount of energy required to stalk and kill their prey; it's a survival mechanism. BRB's are also known to eat carrion, so I wouldn't worry that yours snuck up on and wrapped the feeder rather than striking and wrapping.
#2 - BRB's are kept at cooler temperatures than other boas and pythons so they take more time to digest a meal. Too small of a feeder isn't an issue, but too big of one could be. When feeding mine I lean toward the small side. These guys are called 'slender boas' for a reason.
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