| Robert A Matthews |
Yes, if the percentile roll comes up that you blink to the ethereal plane. I like to think you aren't blinking back and forth so fast that you look translucent. I think of it more like how the sorcerers from gauntlet blink in and out when they walk.
http://youtu.be/7mMJio2MO6w?t=2m13s
On each attack roll, and each roll to maintain the grapple, you roll the 50% chance to become ethereal and the grapple would automatically end if it comes up that you go ethereal. Likewise, when you roll to attack, cast a spell, etc., you would roll again. Any of those rolls that come up as you going ethereal would also end the grapple.