They just mean they grabbed the laptop off the table before formally arresting him, i.e. they distracted him with a diversion of an argument, another agent grab

They just mean they grabbed the laptop off the table before formally arresting him, i.e. they distracted him with a diversion of an argument, another agent grabbed the laptop from the table, and another agent physically detained him and arrested him. So he couldn't close the laptop and enact the encryption.