Judging by Beck's reaction to the guard, and by the guard's description of a black haired girl being suspected for last night's fire, Sayaad became worried about Beck's situation. If it was true that she was responsible for the fire, and in turn responsible for the one man having died, the guard would likely take her in and she would be imprisoned and penalised heavily. Considering her connection to the bar, it probably wouldn't be difficult to accuse and punish her regardless of whether or not she's guilty. Though even if Sayaad hadn't known her very long, he did sense goodness in her. If she was innocent he wanted to help protect her from getting taken in, and if she was guilty, he wanted to keep the guards away from her since he thought she deserved a second chance. Because if she wasn't worth a second chance for her potential crime, then Sayaad himself certainly wasn't worthy of a second chance for his past misdeeds.
It seemed like Siy was quick to distract the guard. Sayaad wondered if she was feeling similarly to him about the situation. For now things seemed to be under control so Sayaad stayed quiet, but was ready to take action in case the situation should escalate.