what? i really don't understand your question. can you explain it a bit more.
what i was saying is that hydrogen is only explosive when it is mixed with an oxidiser (lets use oxygen for simplicity but it applies to others as well) so a mixture of 2:1 H2:O2 would be explosive. but a mixture of 200:1 H2:O2 well, you probably couldn't even get that to burn.
so, if you have a bag of pure hydrogen and you light it on fire, it will only be a narrow band around the boundary of the hydrogen that will be burning. inside you will have pure hydrogen and outside you will have the oxygen in the air.
the bit that burns is where enough oxygen has mixed to allow it to burn.