How are you handling stealth in combat?

[Tenex]

In the description it says you can evade even close pursuit on a 4d roll. One cited possibility for escaping pursuit is a "wide spot". So it seems the intent is to allow the disappearance of the character even under close observation and with poor hiding opportunities.

I don't think the description allows for hiding while under direct observation, but it seems to allow for hiding if even momentarily out of view. And it seems like it allows for hiding from someone who passes only a few feet away in close pursuit.

This seems to make it applicable in combat. If a foe turned away to a side hex, and certainly to a rear hex, it seems the character could be allowed to make a roll.

Would you allow a character to fire a missile weapon and then use stealth to disappear as long as they weren't under direct observation? For instance, a multi-hex foe is fighting the PCs and a character to the side in a shadowed area fires an arrow. The foe turns to look at where the arrow came from, but the character makes the stealth roll and disappears.

I wouldn't make it invisibility, but I was thinking of making the stealthed character Blurred (-4 DX attacks) if they made continued 4d DX rolls during combat and they were at least 3 mega hexes away from the target.

Thoughts?