Can Express.js render different routes on same 'res' object?

Can I have the following config in route/index.js ?

exports.PageA = function(req, res) {
...
...
    if(req.method == 'GET') {
        if (condition1) {
            //PageA has 2 .js files
            res.render('PageA', { title: 'A', layout: false});
        }
        else {
            //PageB has 2 + 2 .js files
            res.render('PageB', { title: 'B', layout: false});
        }
    }
    else {
        res.render('PageC', { title: 'B', layout:'some_other_layout' });
    }
};

Case: mywebsite.com/PageA renders correctly when condition1 passes (with all scripts loaded and executed correctly)

Issue : But when condition1 fails, I get PageB rendered, javascripts in PageB.ejs are rendered but not executed, say, on $document.Ready(). Strangely if I 'Refresh' the already rendered PageB in browser, javascripts are then executed correctly.

As a piece of info: I use defer="defer" tag in all "< script >..."

What am I missing here?