Eli's appearance wasn't surprising for the four, as Rigo was keeping an eye over her all the time. Once she showed the earliest sign of her intentions, Rigo gave the command for his droids to move and flank her from behind.
She was thinking she had the upper hand there, how naive she was! Just before her hands could touch the triggers, she was hit by a paralyzing ray that shot from a special old weapon of one of the droids.
He was like Rigo, a humanoid, who began to walk rapidly towards the fallen, without the ability to move, Eli. Once there, he extended his arm to take the cannon and guns from her possession.
The first and foremost important order he received from Rigo was to secure Eli, and make sure she wouldn't pose any threat to herself and others.
He gave these weapons to the droids with him, three others who came all the way from the armory.