Inertia screens that neutralize sonic crying

While doing a bit of research I came across the following in SF3 Sundown on Starmist;<br /><br /><b>Weeping Wallows</b><br /><b>Type </b>Plant<br /><b>Number </b>NA<br /><b>Move </b>NA<br /><b>IM/RS</b> 6/60<br /><b>Stamina </b>35<br /><b>Attack </b>65, range of 100m<br /><b>Damage </b>-20 on all attack rolls<br /><b>Special Attack</b> Sonic crying<br /><b>Special Defense</b> Immune to sonic attacks<br /><b>Native World</b> Yazirian planets<br /><br /><b>DESCRIPTION</b>: The true weeping wallow is a curiosity on most worlds as it makes crying sounds. However, the low frequency weeping of a construct causes disquiet to all within 100m who hear it. The frequency reduces all attack rolls by 20 in addition to all other modifiers and damage. <u><i>Inertia/sonic screens can neutralize the sound effect</i></u>.<br /><br />Appears to be an inconsistency... Any comments or observations?<br /><br />Here is mine. Since interia screens &quot;slow down&quot; incoming physcial attacks, why not all forms of the physcial realm including voice, sand storms, blizzards, water pistol attacks and sonic crying.<br /><br />Sonic crying.... <img src="http://starfrontiers.us/modules/tinymce/tinymce/jscripts/tiny_mce/plugi…; alt="Innocent" title="Innocent" border="0" /><br />