Sirius arrives
It had been hell getting out, even after his run in with Bellatrix. His heart was pounding and he didn't stop again, didn't join any of the fights he saw on his way to an exit, just kept running. And it wasn't until he was outside, panting for breath and feeling like he might just die that Sirius actually felt the extent of his injuries.
He couldn't just stay there though, he was too close, and passing muggles who managed to spot him struggling to catch his breath in the alleyway looked at him like he might be crazy and hurried past.
Get to Hogwarts. He reminded himself of Jamie's message, when he got to the castle then he could let himself fall down the way he wanted to right then. He gathered himself up and apparated directly to Hogwarts, just outside the gates. He didn't bother going home - not when he just wanted to lay down, the temptation would be too great there.
It was chaos at the castle too, people arriving searching for loved ones. Trying to figure out what they were doing. Sirius, tucked his wand away and pressed a hand to his shoulder slowly making his way up to the castle, looking for anyone he knew, maybe someone he knew who was good with healing spells - that sounded nice right about then.