While it may not be as effective or accurate as a direct spray, an arc of the pepper spray would still have a chance to blind multiple imps since they were right next to her. It would take a little more of the spray then one direct squirt, but the results would most likely be worth it. 
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Sasha Arc Spray Attack: 27 - 8 Projectile Weaponry - 5 Skill Bonus = 14

Imp 1 Dodge: 9

Miss...

Imp 2 Dodge: 44

Hit! Blind Status Caused
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One Imp managed to duck away in time to avoid the blast of pepper spray, but another wasn't so lucky. It got hit in the eyes, causing it to snarl and growl loudly in pain, allowing Sasha to back away to both Ren and Lucian to sort of get the group back together. As she backed away a window appeared in front of her, mentioning that her Spray Weapon Mastery skill's level increased by one. 

"Observe". Ren said this as Sasha came towards them, looking at Sasha now. "You just took twelve damage, you only have 7 HP left. Ill heal you some the moment I get the chance". Despite Ren's earlier cold demeanor and clear dislike of the company of any person he wasn't heartless and did not want any of them to die. "For now just stick back behind us".