Yes this happens in all realms. In my own realm, I can think of two people off the top of my head who are extremely cowardly... my advice to everyone is to DEAL WITH IT!
Some people just can't take the hit on their ego if they die. Sad to say, but a lot of people think of this as more than just a game and will have their day completely ruined if they get killed by someone in another realm. Drowning isn't the only coward move I see regularly. I also see people logging off inside of forts so they don't get killed after a capture.
[SIDENOTE]
On the teebag topic... people take this game too seriusly. Just because I killed you (or more appropriately you killed me
) is not a reason to hold a grudge. If a hunter killes you while afk at the save and then dances on your corpse... that is a reason to hold a grudge. Grow up people!
[/SIDENOTE]