Bloody hell, some harsh responses here. Asthma is a serious, sudden-onset condition that can, and does, kill people. My mum has it quite badly and my DH and DS have the exercise induced variety.
My DS in particular can go downhill in a flash. The first time it happened he was playing about with his cousins, right as rain, then being blue-lighted to hospital within half an hour.
You don't leave someone who is gasping for breath to wander around trying to find their medication, even if they're still able to walk.
In a similar vein, my dad managed to come downstairs in the midst of his massive heart attack and ask my mum to call him an ambulance. Should she have said 'well, you're obviously alright, climbing stairs and all - do it yourself, you lazy bastard?' His heart stopped in the ambulance. Luckily he's still with us due to her quick response.
You don't fuck about when someone, anyone, is in respiratory trouble.