How mage spells interact with walls/barriers?
<p>When Im hunting with friends, sometimes they are standing next to wall and wave, but the wave cuts in half and does not hit the entire pull, as it would normally.</p><p><span normally, like the picture below:</p><p><img alt="" src="https://i.gyazo.com/8830e2542e77f04a84c00070351c88b3.png" style="height:225px; width:429px"><span style="color:#ffffff">.</span></p><p>But, sometimes even when the druid is right next to a wall, the terra wave comes full, and doesn't cut in half.</p><p><span style="color:#ffffff">.</span></p><p>So I'm wondering, how does those interactions work? Is there any rule?</p>