I had this happen a month or two back. Busy river boats, sups, kayaks, you name it coming past. No fish. Ole mate could have waited 10 more seconds but chose to land his sinker 1-2m from my sup. I turned to stare and he gave me a slight wave with one hand. Eyes widened a bit as the sup did a sharp 90 degree turn and headed straight in to him, and it turns out I've got 10cm & 20kgs on him.
"What was that about champ?"
- "I knew exactly where it was landing"
"Well in that case why didn't you land it exactly not right the fk on top of me?"
- "It would only have hit your ankle"
"Eh? "
- "I gave you a wave"
"not good enough. try Sorry next time. Or using your brain and save us all the aggro"
Backed off at that point, sat back on the sand 50m away and stared to see if he'd to it and the next sup coming past.
I'm not sure why but he packed up a minute or two later and scarpered.