The whole firehouse would be in shock. They would rally around her, taking turns to visit her in the hospital. Herrmann would likely bring her some of his home - cooked food to cheer her up, and the younger members would be eager to do whatever they could to help her recovery.
Severide would be determined to find out what happened exactly. He'd be using his detective skills (if he has any in that situation) to figure out if there was any negligence or if it was just a freak accident. And he'd be very protective of Brett during her recovery process, making sure no one disturbs her while she's resting.
The other characters would likely be very worried. Casey, for instance, would probably be the first to rush to her side. He'd be extremely concerned and determined to get her the best medical help. The rest of the firehouse crew would also be in shock. Boden might start organizing the rescue operation and making sure everything is done right to save Gabby. The paramedics would immediately spring into action, assessing her injuries and doing what they can to stabilize her on the spot.
One possible scenario could be that during a rescue operation, there's a sudden collapse of a building. Brett might be in the wrong place at the wrong time and get hit by falling debris, injuring her leg or back severely. This would not only put her in physical pain but also cause emotional distress among her colleagues who care about her.
Yuki would likely be very concerned. He has a soft spot for Tohru and would probably rush to her side, trying to find a way to help. He might even blame himself if he thinks he could have prevented it. Kyo, on the other hand, would initially be angry, but that's just his way of showing worry. He would be more hands - on in getting her the help she needs.
Li Shang would probably be very concerned. He might blame himself for not protecting her better. He would immediately call for the best medical help available and stay by her side until she recovers.
His friends would likely be very concerned. They might immediately rush to his side to check on his injuries. For example, they could call for medical help or try to stop any bleeding if it's a more serious wound. They would also offer words of encouragement and support, telling him not to worry and that he'll get better soon.
Jim, her husband, would be extremely worried. He would immediately rush to her side, using his medical knowledge to assess her injuries. He would be determined to protect her and keep her safe while she recovers, perhaps even getting a bit overprotective.
Simon would probably be very practical. He'd immediately assess Alvin's injury and start coming up with a plan to treat it. He might run around looking for first - aid supplies or trying to contact someone who can help. Theodore, on the other hand, would be really worried and emotional. He'd be right by Alvin's side, holding his hand and trying to comfort him with kind words.
The other characters would be very concerned. Dewey, the teacher, would probably immediately rush to her side and make sure she gets proper medical attention. Zack might be in shock at first, but then he would step up and try to take on some of Summer's responsibilities in the band, like leading the rehearsals. Freddy would be constantly checking on her, bringing her little gifts to cheer her up. And Tomika would be the one to comfort Summer emotionally, listening to her fears and frustrations about getting hurt and being unable to perform for a while.
The other characters would be deeply affected. Zuma might use his water skills to cool Skye down if she has a fever from her injury. Everest, if she's involved, would use her snow - related skills to create a makeshift ice pack to reduce swelling. All the characters would show their loyalty and friendship by staying by Skye's side and doing whatever they can to help her recover.
Simon might be in a bit of a panic. Since he's her friend and also not as used to the dangerous situations as the other Shadowhunters. He'd try to do whatever he can to help, like getting help from more experienced Shadowhunters or trying to comfort Clary while she's in pain.