Staircases are all the rage in my house

Lately Asher is enamoured with the staircase. He pulls over toys that are tall enough for him to stand on and then climbs over the baby gate. The problem is that he usually chooses this toy:

Notice the lack of brakes or kickstand...basically anything resembling something that would disable it from actually SLIDING out from under him when doing this:

You can see how safe and man-like this option is, so...I decided that I'd start letting him go up and down the stairs locked in between the upper baby gate and this lower one so he could get used to it. His sister, after all, was a stair climbing pro by his age, but she also didn't have some kind of death wish like he seems to, she only used them when she needed to. Ultimately, I think it'd be safer if he could get used to the stairs versus him utilizing all kinds of toys and then potentially killing himself when falling onto the concrete floor.

While letting him practice this morning, he and Ayris decided to play a game where they would take turns being "caught" in the net and yelling "HELP" while the other would come down to rescue them. It's all very dramatic (notice how Ayris even grunts as she "struggles" to save her brother). Also notice that Asher is less inclined to help his sister when the tables are turned. He takes his sweet time before even coming to her rescue and then when he finally gets down there, he decides he'd prefer MOM! save her!