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The general rule is to start a new paragraph for dialogue or action by a new character. Everything you wrote here is Lisa describing and thinking about what Jack has said or done. So, yes, it can ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/47145 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/47145 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
The general rule is to start a new paragraph for dialogue or action by a new character. Everything you wrote here is Lisa describing and thinking about what Jack has said or done. So, yes, it can go into one paragraph. But it doesn't have to. If you feel more comfortable breaking up, then break it up. The new paragraph will allow the scene to breathe a bit more. I would break it after "score." Why? Because that is likely when the characters are pausing as well. Lisa is checking out her new book and getting far enough with it to realize it's a music score (something that will take her longer than it would someone glancing at a traditionally printed one). They're both enjoying the moment that Jack's gift created. > "Hang on, I got you this," Jack said, thrusting a book into Lisa's hands. "I didn't exactly know what I was looking for, but this place has everything." He took her hand and guided it to the top of the book, where Lisa could feel the raised bumps of braille under her fingertips; it was a music score. > > "Lisa, you gotta come with me to see—" Lisa could feel the panic vibrating through him as soon as the words left his mouth. "Shit, sorry," he said. "I am so sorry." This way there is time for both the characters and the reader to shift to the next part, which is Jack starting a new topic of conversation. It also helps frame his screwup and allows the reader to feel his panic along with Lisa.