Queue them up...

'Dammit! No time to deal with those freaky mantis nymphs myself. Spring Brawler!'

[At your service, ringmaster!]

...

'Oh yeah! The words we're-'

"SKREEE!"

"Shit!"

Rianna was a touch slower than she needed to be as one of the mantis goblin nymphs had used her moment of hesitation and thought to just bumrush for her throat. At the same time, the other four used this opportunity to go for her legs and arms.

While the group's attack was coordinated, it wasn't simultaneous.

At this point, the group of mantis goblins realized that there was a bit of a wind-up or recovery period for Rianna every time she swung her flaming saber. Meaning, the moment Rianna deflected the attack aimed at her throat, her arms and legs would be vulnerable long enough for the rest of the mantis goblins to rush in and get to work.