如图所示，褐色与绿色部分为蛛网术。房间高10尺，黑色为石头墙壁。法师在最右下角的白色空格。法师释放火球术，穿过蛛网的范围，打到了左上角。
你和对手之间若至少有5英尺蛛网，就会形成掩蔽。若你们之间的蛛网有20英尺以上，则形成完全掩蔽。
————问题1：蛛网有挡视线，火球的落点能选多远？不能超过20尺的格子选火球落点吧？。
一颗豌豆大小的炽热小球会从指尖飞出，之后除非在到达前撞上物体或固体阻碍物，否则会在指定点爆炸开。（提前碰撞会在那点炸开。）如果你尝试让小球通过狭窄通道，例如箭孔等，你必须通过一个远程接触攻击来“命中”那个开口，否则就会撞上阻碍而过早引爆。
————问题2：蛛网的存在，是否会让火球撞上，从而提前引爆火球术？那个远程接触的命中是多少DC？
————问题3：当法师处于沉默术范围中，是否能使用火球术卷轴？
我查了卫生纸网站，说不可以用。
When activating an item requires an action from you, you usually also must speak; the rules don't say so, but you reasonably can assume that doing so is much like completing a spell's verbal component.
You must speak in a strong voice, and anything that keeps you from speaking, such as a silence spell or being pinned in a grapple, keeps you from activating the item.Spell Completion: This is the activation method for scrolls. A scroll is a spell that is mostly finished. The item user must complete the spell's
verbal and somatic components (if it has any), but does not need any material, focus, or XP components the spell might have. (The character who scribed the scroll provided those.)
http://www.wizards.com/default.asp?x=dnd/rg/20041116a
