That's what I mean; it's pressure on a thrower. You contest, early, hard; if he's nervous about his throw, he'll get worse, get more conservative (which means less useful ball), throw more not straight; it's like a batsman under pressure, every dot ball makes him more likely to throw a bat at it and get an edge. TPN started throwing more and more crooked to secure possession until even Bryce spotted it. And once that happens, it's death for a hooker with the yips, because he's between a rock and a hard place, the pressure kicks up even more, and the throwing will start to disintegrate. Rory Best, who had a fine game today, has gone exactly the same way in the past.
Get in his head, early, make him doubt, rack it up with each wobbly throw.