I tested this on officials, my result was a bit different then the one above:
1. If I cast Icewall on an existing ice wall cell, the HP/duration of that cell didn't refresh at all. So you CAN'T reset icewall HP/duration even if you target a different cell.
2. If I cast Icewall so that not a single cell is affected, then it won't show the skill animation as in the video above. However, my SP still get reduced by 20.
3. I CAN target the same cell again for icewall. For example creating a cross works just fine.
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This post has been edited by
Playtester
on Oct 28, 2014 13:32