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Here is a glitch in the arena for you: nearly all the overlays (including the “pause” button) have disappeared.

And, if I may, I would like to draw your attention to that little pig under the ledge. I bet you are wondering how he got there, no? ;)
He was on the structure to the right, but the force of an explosion propelled him to the left, smacking him into that piling, dealing very little damage.
It’s almost like there are assigned masses to pigs based on their size, and impact force is based on F = m * a. However, the mass assigned to the µpigs is so small that the force of impact often does not exceed whatever critical threshold is need for “popping”.
And I think the same goes for birds who’s primary ability is running into objects (e.g., terrence, blues, chuck), though in this case ‘a’ becomes critical, because when they are at the top of their arc where sling acceleration is effectively 0, these birds tend to bounce of objects they should destroy.
Actually, I should say F = (m * a) + α where +/- α scales the total force to add a little randomness.