Situation 78.15.4 (Quasi-splitting). Let $S$ be a scheme. Let $(U, R, s, t, c)$ be a groupoid scheme over $S$. Let $u \in U$ be a point. Assume that
$s, t : R \to U$ are separated,
$s$, $t$ are locally of finite type, and
$s$ is quasi-finite at $e(u)$.