Astral Panthers are bad at hiding.

[Malshier]

When I run towards a pack of Astral Panthers, for about half a second, one of them is very obviously visible and very obviously red named, even when they should be in sneak mode still, before they aggro on me. Doesn't last long, but it gives an easy indication for characters with no spot that there's a pack of panthers right there. I'll try to get a screenshot next time it happens.

[Krelar]

When I run towards a pack of Astral Panthers, for about half a second, one of them is very obviously visible and very obviously red named, even when they should be in sneak mode still, before they aggro on me. Doesn't last long, but it gives an easy indication for characters with no spot that there's a pack of panthers right there. I'll try to get a screenshot next time it happens.

That sounds like normal behavior for big cats. You see them for a brief second, then they're gone. Next thing you know your face is getting eaten. :D