Clear Casting

[Alram]

First let me say that leading with frost bolt followed by fireball will elicite clear casting regularly. Not always two clear casts per battle as Skan noted, but then my battles probably don't last as long as Rylea's. Also AM will dilute the effect. So thank you everyone for all of that!

Here's my little head scratcher:

Frequently my Mage makes the clear casting sound and gesture but no clear casting icon appears on screen. Mana seems to be consumed during the subsequent cast, but, if I've observed correctly, not at the same rate as it would be in normal casting.

Is there any other situation that evokes this exact combination of gesture and sound? If there is, what is it?
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1. I do not regularly get clear casting by leading with frost bolt followed by fireball.

2. The clear casting icon seems to disappear when a spell's casting completes--at the end of a fireball or at the beginnning of AM. Could this phenomena somehow account for your observations?