In the final book, Link kills Abraham Ravenwood. With garden shears.
John interrupting Marian's trial, where she is about to be executed. He just sort of appeared in the crowd, threatened to use his powers on the keepers, and literally leaped over people's heads to get to the stage. And this was enough to get the keepers to back down.
Sure, it was a bad thing to do, but Anti-Hero Ridley deserves some props for using her magic to ruin Savannah Snow's big party, by making everyone start viciously arguing. Doubles as a CMOF.