Actually the clearest way of doing it would probably be
<div class="scene">
<p>...</p>
<p>...</p>
<p>...</p>
</div>
<div class="scene">
etc.
with
div.class + p {
text-indent: 0
}
But I don't think in practice this really gains anything over merely indicating the semantics with a class change. Changing a class is a perfectly valid way of indicating that one block has different semantics to another.