Shark bbox fix and added inuse check after entity thinking

src/g_phys.c

@@ -907,6 +907,12 @@ SV_Physics_Toss(edict_t *ent)
 	/* regular thinking */
 	SV_RunThink(ent);
 
+	/* entities are very often freed during thinking */
+	if (!ent->inuse)
+	{
+		return;
+	}
+
 	/* if not a team captain, so movement will be handled elsewhere */
 	if (ent->flags & FL_TEAMSLAVE)
 	{

src/monster/flipper/flipper.c

@@ -329,13 +329,24 @@ flipper_pain(edict_t *self, edict_t *other /* unused */,
 void
 flipper_dead(edict_t *self)
 {
+	vec3_t p;
+	trace_t tr;
+
   	if (!self)
 	{
 		return;
 	}
 
-	VectorSet(self->mins, -16, -16, -24);
-	VectorSet(self->maxs, 16, 16, -8);
+	/* original dead bbox was wrong - and make sure the bbox adjustment stays in solidity */
+
+	p[0] = self->s.origin[0];
+	p[1] = self->s.origin[1];
+	p[2] = self->s.origin[2] - 8;
+
+	tr = gi.trace(self->s.origin, self->mins, self->maxs, p, self, self->clipmask);
+
+	self->mins[2] = tr.endpos[2] - self->s.origin[2];
+
 	self->movetype = MOVETYPE_TOSS;
 	self->svflags |= SVF_DEADMONSTER;
 	self->nextthink = 0;