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I don't know its parameters -- but you can do this:
package a
{
function fxDTSBrick::onProjectileHit(%this, %a, %b, %c, %d, %e)
{
echo("A: "@ %a.getClassName());
echo("B: "@ %b.getClassName());
echo("C: "@ %c.getClassName());
echo("D: "@ %d.getClassName());
echo("E: "@ %e.getClassName());
parent::onProjectileHit(%this, %a, %b, %c, %d, %e);
}
};