This is a problem for surfers no matter who you are... the one surfing the wave or the one being hit. My best suggestion, as soon as you see him, if he is heading right towards you, and you might just get by, blast as fast as f*ckin possible over the wave, he should, turn slightly to give you a bit more time. If you dont think you can make it, hang back, paddle back even if its going to be close. Again, he shoudl turn a bit to go past you faster. The key though is communtication, tell him your going to try to get over the wave, or tell him that you gonna hang back, and kinda wave him on.